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The M8 Armored Gun System (AGS), sometimes known as the Buford,[5][nb 2] is an American light tank that was intended to replace the M551 Sheridan and TOW missile-armed Humvees in the 82nd Airborne Division and 2nd Armored Cavalry Regiment (2nd ACR) of the U.S. Army respectively.

M8 Armored Gun System
M8 AGS at Aberdeen Proving Ground
TypeLight tank[nb 1]
Place of originUnited States
Production history
DesignerFMC Corporation/United Defense LP
DesignedFrom 1983
ManufacturerUnited Defense LP/BAE Systems
Produced1995, 2020
No. built6 AGS pilots, 12 Mobile Protected Firepower
Specifications (M8 AGS)
Mass36,900 to 39,800 lb (16,740 to 18,050 kg) (level 1 armor)[2][3]
44,000 to 44,270 lb (19,960 to 20,080 kg) (level 2)[2][4]
52,000 lb (23,590 kg) (level 3)[2]
Length261.4 in (6.64 m) (Level 1 hull + gun forward), 241.9 in (6.14 m) (Level 1 hull only)[2]
Width104 in (2.64 m) (over fenders)
Height100 to 101 in (2.5 to 2.6 m) (over cupola)
Crew3 (commander, gunner, driver)

Elevation+20° / -10° (depression limited over rear arc)

ArmorWelded 5083 aluminium alloy
Main
armament
M35 105 mm caliber soft recoil rifled gun (31 rounds)
Secondary
armament
7.62 mm coaxial M240 (4,500 rounds)
12.7 mm commander's M2 Browning (600 rounds)[2]
EngineDetroit Diesel Corporation 6V 92TA
550 hp (410 kW) at 2,400 rpm (JP-8 fuel),
580 hp (430 kW) at 2,400 rpm (diesel)[2]
Power/weight28.3 hp/ST (23.3 kW/t) (Level I)[2][2]
TransmissionGeneral Electric HMPT-500-3EC[2]
SuspensionTorsion bar[2]
Ground clearanceUp to 17 in (430 mm)
Fuel capacity150 US gal (570 l; 120 imp gal)
Operational
range
300 mi (480 km)
Maximum speed Road: 45 mph (72 km/h)

The M8 AGS began as a private venture of FMC Corporation, called the Close Combat Vehicle Light (CCVL), in 1983. The Army began the Armored Gun System program to develop a mobile gun platform that could be airdropped. By 1992, the AGS was one of the Army's top priority acquisition programs. The service selected FMC's CCVL over proposals from three other teams. The service sought to purchase 300 AGS systems to begin fielding in 1997.

The Army canceled the M8 AGS program in 1996 over the objections of Congress and the Department of Defense, due to the service's budgetary constraints. The Sheridan was retired without a true successor. The AGS never saw service, though the 82nd Airborne sought to press a limited number into service in Iraq. The AGS was unsuccessfully marketed for export, and was reincarnated for several subsequent U.S. Army assault gun/light tank programs. United Defense LP proposed the AGS as the Mobile Gun System (MGS) variant of the Interim Armored Vehicle program in 2000, but lost out to the General Motors–General Dynamics' LAV III, which was type classified as the Stryker M1128 Mobile Gun System. BAE Systems offered the AGS system for the Army's Mobile Protected Firepower requirement, but lost to the General Dynamics Griffin in 2022.


Development


The Army recognized the poor performance of the M551 Sheridan light tank in Vietnam and, in 1977, began the process of retiring the vehicle. A small number were retained in active service by the 82nd Airborne Division and the National Guard.[nb 3] The Army designated the M3 Bradley cavalry fighting vehicle to partially fill the Sheridan's role.[8]

Close Combat Vehicle Light at the National Museum of Military Vehicles in 2020
Close Combat Vehicle Light at the National Museum of Military Vehicles in 2020
View of inside of CCVL
External images
Photos of the Close Combat Vehicle Light from a private collection.
gallery #2
gallery #3

In the 1980s, the United States Army began looking for a more capable replacement for the Sheridan. During this time, a string of Army projects to update or replace the Sheridan were begun, but all ended without the Army committing to buy.[9] Some of its efforts around this time could be described as hopelessly intermingled.[10]

In 1979, Army Chief of Staff General Edward C. Meyer initiated a transformation of the 9th Infantry Division that would see the light infantry division assume many of the characteristics of the heavy division through an infusion of high or emerging technology.[11] The so-called "High Technology Light Division" would require the procurement of a Mobile Protected Gun, later called the Assault Gun System (AGS), and a Fast Attack Vehicle. The notional Mobile Protected Gun was to be armed with a kinetic gun, or possibly a missile, capable of defeating enemy armor.[12] In any case, the service determined that it needed a more immediate solution for the AGS requirement. In 1985, the Army approved a U.S. Army Training and Doctrine Command (TRADOC) recommendation to field the TOW missile-armed Humvee in the interim.[13] The TOW-armed Humvee proved to be an inadequate substitute for the AGS in the 9th Infantry Division as it could not fire on the move and was too lightly armored.[14]

In 1980, the U.S. Army Infantry School's Mobile Protected Gun project analyzed anti-armor weapons systems, concluding that the Army should equip its new light infantry divisions with TOW-armed Humvees and an unspecified 6×6 lightly armored vehicle armed with a 25 mm caliber gun. This led the Secretary of Defense to direct the Army to use the LAV-25 for this purpose. In 1981, the Army joined the Marine Corps's Mobile Protected Gun System program.[15] The MPGS was canceled the following year.[9] The basic chassis of the Sheridan was considered to be in good working order even if its problematic 152 mm caliber gun/launcher was not. Both the Marine Corps and Army explored re-gunning the Sheridan with a conventional gun. In 1983, the Naval Surface Weapons Center mounted a 105 mm cannon to a Sheridan. One Army plan also envisioned re-gunning a few dozen Sheridan with 105 mm or 120 mm cannons, but this project was canceled in 1985.[16]

After the cancelation of the MPGS program, the project morphed into the Armored/Assault Gun System.[17][nb 4] In 1983, the Army established the AGS program.[19] In 1985, Army Vice Chief of Staff General Maxwell Thurman approved an amended Requirement Operational Capability (ROC) for the Armored Gun System. Thurman recommended that the Army purchase 500 AGS systems.[7][nb 5] The Army Chief of Staff did not advocate for funding the program in Congress, however, given its low priority.[20] Senate appropriators declined the Army's request for AGS funds for FY1986. The program office was disestablished, and the ROC retracted.[21] In May 1986, the AGS program was re-organized under the Armored Family of Vehicles Task Force (AFVTV).[20] During one concept study for a proposed All Purpose Fire Support Platoon, the task force shortlisted four candidate vehicles for an Armored Support Platform. These were the FMC Corporation Close Combat Vehicle Light (CCVL), the Cadillac Gage Stingray, the General Motors LAV-105, and the Teledyne AGS. The task force recommended the latter.[22]

In 1987, the Army tested a version of the LAV-25, designated as the M1047. The Army determined that these were unsuitable for LAPES, and with only a 25 mm caliber cannon, could not match the firepower of the Sheridan. Congress did not favor the M1047,[23] though a few were deployed with the 3/73rd Armor of the 82nd Airborne Division in the Gulf War.[24]

In August 1987, the Office of the Secretary of Defense approved the AGS program initiative for 600 vehicles. A joint Army–Marine Corps program was mooted. The ROC was approved for the second time in September. In December, the AGS program was dropped as the $800 million ($1.91 billion in 2021) plan was considered unaffordable.[25][20] Around the same time, the Army Chief of Staff issued a "promissory note" to replace the Sheridan by FY1995.[20]

In September 1989, the Armored Gun System Project Manager office was reestablished at the United States Army Tank-automotive and Armaments Command and a marketing survey was distributed to industry.[26] The Army formalized the AGS program in April 1990 with the issue of a new ROC.[27]

In November 1990, the Defense Acquisition Board authorized the Army to proceed with development of the AGS.[28] The Army believed that replacing the Sheridan with an off-the-shelf AGS would be less expensive and provide more capabilities than an upgraded Sheridan.[29] In addition to being expected to replace the Sheridan in the 3/73rd Armor,[30] it was to replace TOW missile-armed Humvees in the 2nd Armored Cavalry Regiment (2nd ACR).[31][32]

In 1991, the Senate and House Armed Services Committees joined in directing the Army to integrate the turret and Watervliet Arsenal EX35 gun of the LAV-105 with an AGS chassis.[33][34] A joint program was balked at by both services, who believed the two platforms were mismatched.[35] Subsequently, the Marine Corps demurred and requested no further funding for the LAV-105.[34] In any event, the proposed chimera was nixed by the Senate Appropriations Committee later that year.[36]

The AGS program had gathered steam by this point due in part to the back-to-back successful employment of the Sheridan in two overseas operations. In December 1989, Sheridans of the 3/73 Armor were airdropped into Panama as part of Operation Just Cause. This was the first successful employment of light armor in combat. In August 1990, Sheridans were airdropped into Saudi Arabia as the spearhead of the buildup of Operation Desert Shield.[37]

The Army issued a draft request for proposals (RfP) in May 1991. The Army published the RfP in August incorporating changes as a result of feedback from industry and Congress, the latter of which had directed the Army to require the EX35 gun.[38] Army Acquisition Executive Stephen K. Conver became concerned that the AGS program was becoming laden with unnecessary requirements that would increase costs and development time, as well as limit the number of interested contractors.[35] In view of this, in October 1991, Conver's office conducted a review of the requirements. The Army updated its RfP later that year, with submissions due in December.[39] Following the deferment of the RAH-66 Comanche and Block III tank, the AGS was among the Army's top priority programs. After having earlier tried to kill the tank, appropriators grew to appreciate the program's relatively low price tag.[35]

FMC Corporation submitted the Close Combat Vehicle Light to meet the AGS requirement.[40][41]

Three other teams submitted proposals:[42]

In June 1992, the Army selected the FMC proposal. FMC was awarded $27.7 million ($53.5 million in 2021) to begin phase 1 work, including the production of six test units.[40] The bids for this phase ranged from a high of $189 million ($365 million in 2021) for GDLS–Teledyne and a low of $92 million ($178 million in 2021) for Hägglunds.[43] The procurement program was valued at $800 million.[40]


The Close Combat Vehicle Light becomes the AGS


An AGS prototype with level I armor in 1994
An AGS prototype with level I armor in 1994

FMC began developing the Close Combat Vehicle Light as a private venture in 1983. The vehicle was designed from the outset to meet the Army's as-yet unfunded Armored Gun System requirement. FMC built two mock-ups. The first was a front-engine model utilizing a 330 hp (250 kW) diesel engine. The second was a rear-engine model with a 552 hp (412 kW) diesel engine and featuring more armor. In 1984, FMC validated the feasibility of pairing the 105 mm gun with a light chassis by test firing a 105 mm gun mounted on an M548. The first prototype CCVL was completed in August 1985 and debuted at the meeting of the Association of the United States Army in October.[21] The CCVL was demonstrated at Fort Bragg in 1987.[41]

The Army did not originally require that the AGS be air-droppable by the C-130, believing that the requirement would deter submissions.[44] Nevertheless, FMC's proposal claimed that this desired capability was possible with its design. After winning the contract, FMC made several weight-saving changes to the design, particularly the pallets, in order to meet the C-130's weight limit.[45]

In a December 1993 report, the Defense Department Inspector General cautioned that the AGS would be too heavy for low-velocity airdrop. The report said the AGS did not meet the Army's requirements for air mobility, and recommended delaying low-rate initial production until the airdrop requirement could be met.[46] The Army strongly refuted the IG's report.[47] The IG's concerns were put to rest in October 1994, when the service successfully airdropped an AGS from a C-130 at an altitude of 1300 feet.[48]

Citing cuts in procurement funding, in 1993, the Army cut its planned AGS order from 300 to 233. In 1994, the Army settled on an acquisition target of 237 vehicles.[49] Of these, 123 would go to the 2nd Armored Cavalry Regiment, 58 to the 82nd, and 56 to reserves and training bases.[50] The last 169 AGS systems, to be produced from 1998 to 2002, were to be built without the weight-saving modifications of those destined for the 82nd, which was the only unit that required an airdroppable AGS system.[51]

An AGS prototype with level II armor fires its main gun in 1994. Note the presence of track skirts.[nb 6]
An AGS prototype with level II armor fires its main gun in 1994. Note the presence of track skirts.[nb 6]

Six prototypes were built under the designation XM8. The first of these was rolled out at the United Defense (created by a merger of FMC and BMY) facility in San Jose, California, in April 1994,[30] and arrived at Fort Knox, Kentucky, in April 1995.[53] The last of these was delivered in May.[54] United Defense provided five XM8 AGS systems to the service's Operational Test Command, which put the vehicle through five months of testing at Fort Pickett, Virginia. Another prototype underwent survivability testing at Aberdeen Proving Ground, Maryland.[55]

In 1995, the Army explored cutting the 2nd ACR, which would reduce the Army's buy to 80 AGS for the 82nd Airborne. In May 1995, the National Guard expressed interest in procuring the AGS for the 38th Infantry Division, 35th Infantry Division and 34th Infantry Division in order to help bridge the looming capability gap should the 2nd ACR be eliminated. This proposal was rejected by the service.[56] In October 1995, the Army type classified the XM8 as the M8 Armored Gun System.[57] It approved an initial production run of 26 vehicles,[54] with an option for 42 more scheduled to begin in FY1997.[55] A full production decision would be reached in 1997.[2] Fielding to the 3/73 Armor would begin in 1999. All three squadrons of the 2nd ACR were to be fielded subsequently.[58]


Cancelation


AGS production schedule as of 1995[4]
YearOrdersDeliveries
1996260
1997424
19983331
19994040
20004035
20013540
20022139
2003nil36
2004nil12
Pre-production unit circa 1994
Pre-production unit circa 1994
Pre-production unit in level 2 armor circa 1994
Pre-production unit in level 2 armor circa 1994

The end of the Cold War had precipitated a fall-off in U.S. military spending.[54] The President's FY1996 budget request allotted the Department of Defense (DoD) the lowest procurement budget level since 1950.[59] The AGS was one of several systems that did not fare well in an Army review of anti-armor weapons then under development.[60] Responding to budget cuts anticipated in the period FY98–03, in 1996 the Army adopted a new policy: Instead of distributing small cuts throughout many projects, entire programs would be canceled.[61] Army Chief of Staff Dennis Reimer canceled the AGS in January 1996.[62]

Many officials felt blindsided by the Army's decision to kill the AGS.[63] The Army's decision to cancel the AGS lacked a formal announcement, but was soon leaked to the press. This displeased some lawmakers including Senate Armed Services Committee chairman Strom Thurmond, who privately expressed irritation to Defense Secretary William J. Perry about having learned of the cancelation through media reports.[62]

Ten Representatives signed a letter urging Perry to continue on with the program. The letter touted the program's "tremendous success" in meeting the program's objectives, and noted that the vehicle was "well within budget and on schedule."[63] The House appropriations national security subcommittee requested that the DoD pause the cancelation of the AGS pending a Congressional review. The subcommittee said that the AGS had met its milestones and "would be a strong candidate for increased funding."[62]

The Army belatedly sought to win Congressional and DoD support for its decision to cancel the tank. Securing the blessings of the Office of the Secretary of Defense would ensure that the service would not have to forfeit unspent FY1996 funds from the AGS program. The DoD, at least at first, affirmed its support for the program and called it "premature" for any service branch to draw any conclusions about the outyear funding environment.[62] However, in February the Joint Requirements Oversight Council (JROC) endorsed the Army's decision.[64] Despite JROC's recommendation, Perry withheld his support for canceling the AGS until he could personally meet with key congressmen. Perry's office said it would review the Army's plans for the $1 billion originally earmarked for the AGS before making a decision.[64]

The Army issued a stop-work order to United Defense in February.[57] In May 1997, the Army Vice Chief of Staff formally announced the cancelation of the AGS.[61] The service estimated killing the program would save the Army $1 billion. The service sought to reallocate unspent FY1996 funds from the AGS program on military pay, construction and modernization programs.[62]

In order to help offset the loss of capability caused by the cancelation of the AGS, the Army increased its requested funding for M1A2 Abrams and M2A3 Bradley upgrades, and accelerated the development of the Javelin missile.[65] The Army considered a variety of plans to "heavy up" the 2nd ACR.[66] The service added heavy armor to the 2nd ACR and requested funding to purchase Apache helicopters.[67] In the 82nd Airborne, the Army also planned to introduce the EFOGM missile and considered more widely fielding the Javelin missile.[68][69] Funding for EFOGM was deleted in 1998.[70] The Army also considered the Humvee-mounted MGM-166 LOSAT missile, another platform offering similar capabilities for the 82nd Airborne.[71] However, this program was canceled in FY2005.[72]

The 3/73rd Armor was inactivated over the following two years. The last Sheridans in service were vismod Sheridans used for opposing force training. These too were retired in 2004.[24] Maintaining the Sheridan was not thought to be practical.[64] In place of the Sheridan in the 82nd Airborne, the Army stood up an Immediate Ready Company of Bradley Fighting Vehicles and M1A1 Abrams tanks from the 3rd Infantry Division which were to be attached to the 82nd.[24]


Proposed revivals


In 1998, the Senate Armed Services Committee proposed using the M8 AGS as a surrogate vehicle to evaluate "strike force experimentation activities" in the 2nd Cavalry Regiment.[73]

An M8 AGS rolls off a C-130 for a platform performance demonstration at Fort Knox circa December 1999
An M8 AGS rolls off a C-130 for a platform performance demonstration at Fort Knox circa December 1999

United Defense LP (UDLP) proposed the AGS, as well as a version of the Mobile Tactical Vehicle Light, for the Mobile Gun System variant of the Interim Armored Vehicle program in 2000.[74] United Defense provided an AGS armored in level 1 and 2 for a platform performance demonstration from December 1999 to January 2000.[75] By then, the AGS had reached an advanced level of technological maturity, and thus UDLP said it could field its design almost two years earlier than the General Motors' LAV III proposal.[76] The AGS lost out to the General Motors proposal, which was type classified as the Stryker M1128 Mobile Gun System.[77] UDLP protested the award, alleging that the Army disregarded its own timeline requirements, and that the requirements had been crafted with a wheeled vehicle in mind.[76] The General Accounting Office denied UDLP's protest in April 2001.[78]

In March 2004, at the 82nd Airborne Division's request, the Army approved the transfer of four production vehicles from United Defense's facility in Pennsylvania to Fort Bragg, North Carolina.[79] The vehicles were intended to bolster the 82nd's 17th Cavalry Squadron, which was in need of greater firepower for an upcoming deployment to Iraq.[80] However, in June 2004, this plan was put on hold while the Army determined whether the Mobile Gun System (MGS) could meet the 82nd's requirements.[79] An air-drop test of a Stryker weighted to simulate the load of the MGS was conducted in August. Around the same time, the Army identified issues with the air-worthiness of the MGS, among the heavier of the Stryker family. Still more pervasive problems persisted with the autoloader.[80] While this decision was on hold, Congressman Robin Hayes expressed frustration that the AGS had not been fielded, and called on the Department of Defense to act swiftly to resolve the delay.[81] In January 2005, the Army said it had ruled out fielding the AGS, saying the system lacked spare parts that would be required to maintain the vehicle for any significant length of time. The Army also doubled down on its commitment to fielding the MGS, which it said it could begin fielding in summer 2006.[82]

United Defense sought overseas customers without success. In 1994 United Defense partnered with Rheinmetall to market the AGS to NATO allies. Taiwan had been interested in acquiring as many as 700 of the system,[83] which would be produced domestically. In 1994, the U.S. State Department authorized the sale of just as many to Taiwan and Hwa Fong Industries of Taiwan and United Defense agreed to co-production conditional on the selection of vehicle by Taiwan.[4] In 1996, United Defense had plans to ship one AGS prototype to Taiwan.[84] In 1996, United Defense partnered with FMC Nurol to offer the AGS to the Turkish Land Forces, which was seeking a main battle tank.[84][85] By 1998, Canada, Germany, Malaysia and Singapore had expressed interest in the tank.[85]

In 2015, the U.S. Army articulated a requirement for a Mobile Protected Firepower system to replace the Mobile Gun System.[86] In 2017, the Army formalized its requirements with a request for proposals. The MPF was defined as an air-transportable light tank to assist infantry brigades in forced entry operations. The Army sought to buy 504 MPF systems. Requirements called for a tracked vehicle armed with a 105 mm or 120 mm caliber cannon, which would not need to be air-droppable. BAE Systems (which bought United Defense in 2005) entered a modernized AGS into the MPF competition. In 2018, the Army selected bids from GDLS and BAE to build 12 prototypes each.[87] BAE began delivering the prototype vehicles to the Army in December 2020,[88] although the last of these were delivered behind schedule after testing had begun.[89] The Army's evaluation of BAE and General Dynamics prototypes at Fort Bragg continued through August.[88][90] In February 2022, BAE was eliminated from the competition due to noncompliance issues, leaving the General Dynamics Griffin as the only MPF entry.[91] In June 2022, the Army selected the Griffin as the winner of the MPF competition.[90]


Design


The basic hull of the AGS is made of welded 5083 aluminium alloy,[2] with a modular armor system that allows the vehicle to be equipped according to requirements.[4] Aluminum was chosen instead of steel in order to reduce the weight of the vehicle. The weight limit for the vehicle was driven by the requirement that it be capable of low-velocity airdrop.[92]


Protection


An AGS with level III armor. Note the passive armor boxes.[nb 6][nb 7]
An AGS with level III armor. Note the passive armor boxes.[nb 6][nb 7]

The CCVL hull was all-welded aluminum with bolt-on steel composite armor. Appliqué armor could also be installed by the user.[94]

The AGS was designed with three modular armor levels:

The crew is protected from ammunition explosion by blowout panels on the roof and a bulkhead separating the ammunition from the crew.[4] Unlike the CCVL,[94] the AGS is equipped with NBC overpressure system.[95] The Army omitted a requirement for radiation hardening from the AGS.[35]

Two eight-barrel smoke grenade launchers were mounted to the turret which could fire a variety of obscurants.[4]

The United Defense Mobile Gun System variant included 7.62 mm integral armor protection over most of the vehicle, and 14.5 mm AP protection over the frontal 60-degree arc.[96] BAE equipped the Mobile Protected Firepower variant of the AGS with underbody blast protection from roadside bombs.[97]


Mobility


An AGS with level III armor
An AGS with level III armor
An AGS powerpack is slid out of the engine compartment on a hydraulic tray
An AGS powerpack is slid out of the engine compartment on a hydraulic tray

Power is provided by a Detroit Diesel 6V-92TA 6-cylinder multifuel diesel engine developing 550 hp (410 kW) at 2400 rpm with JP-8 fuel, and 580 hp (430 kW) at 2400 rpm with DF2 diesel.[2][57] This had 65% commonality with the eight-cylinder version of the Heavy Expanded Mobility Tactical Truck (HEMTT).[4] The AGS's power-to-weight ratio was greater than the M1A1 Abrams. The top speed is governor-limited to 45 mph (72 km/h). The fuel capacity is 150 US gal (570 l; 120 imp gal), giving the AGS a projected range of 300 mi (480 km) at a cruising speed of 25 mph (40 km/h).[98] The General Electric hydromechanical HMPT-500 transmission is also used by the Bradley Fighting Vehicle.[99][2] Mounted on two tracks, the powerpack slides out for maintenance, and can be run while it sits on the tracks at the rear of the vehicle.[100] An auxiliary power unit was considered, but ultimately omitted from the final design to save weight.[101]

Many different engines, including a gas turbine, were considered for follow-on versions of the CCVL.[94] The Detroit Diesel engine was replaced in the Mobile Protected Firepower variant with an unspecified model, this one also developing 550 hp (410 kW).[97]

FMC designed the CCVL with to be capable LAPES (low-altitude parachute-extraction system) airdrop from a C-130.[15] The Army required two variants of the AGS. One capable of the low-velocity airdrop from the C-17 Globemaster III (intended for the 82nd Airborne),[51] and a heavier variant with roll-on/roll-off capability from the C-5 Galaxy, C-17, C-141 Starlifter and C-130 Hercules.[35] In 1990, the Army had demoted the requirement for LAPES from a required capability to a desired one.[102] After winning the AGS contract, FMC further whittled down the weight of the AGS in order make the tank light enough for low-velocity airdrop from a C-130.[45]

Level II and III armor packages can be airdropped separately from the AGS and installed in the field in under three hours.[45] All versions are air-transportable by C-130, C-141, C-17 and C-5 (one, two, three and five systems respectively).[103] For low-velocity airdrop, the vehicle is stripped to a weight of no more than 17.8 short tons (16.1 t). The vehicle height is reduced by removing or retracting the commander's cupola.[104] Up to 10 rounds of 105 mm ammunition can be carried in ready capacity.[105] The MPF variant retained airlift capability: one could fit on the C-130 and three on the C-17.[97]

A 1993 TRADOC study called for modifying 53 HEMTTs as Contingency Force Recovery Vehicles to assist with recovering the AGS.[106]


Firepower


M8 AGS autoloader diagram
M8 AGS autoloader diagram

The AGS is armed with the Watervliet Arsenal M35 (rifled autoloading 105 mm caliber soft-recoil tank gun with an M240 7.62 mm caliber machine gun mounted coaxially.[2]

The M35, known as the EX35 and XM35 during development,[57][107] was originally designed and developed by Benét Laboratories, Watervliet Arsenal in 1983 for the Marine Corps Mobile Protected Gun Program.[107] The M35 is about 1,800 lb (816 kg) lighter than the M68 used on the M60 tank.[45]

The M35 fires all NATO standard 105 mm ammunition in inventory.[95] The M35 has a rate of fire of approximately 12 rounds per minute, with a ready capacity of 21 rounds and 9 more in hull stowage.[108] It has a laser rangefinder from the M1 Abrams,[2] and the Computing Devices Canada fire-control system is the same used in the Challenger 2.[4] Prototype versions of the AGS gun had a pepperpot muzzle brake which was anticipated would be deleted in the production version.[57]

The gun is stabilized with a Cadillac Gage two-axis system.[98] Gun depression and traverse is hydraulic, with a manual back up for emergencies.[4] Depression and elevation is −10 degrees, except over a rear 60 degree arc, where it is limited to 0 degrees.[4]

The CCVL was originally armed with Rheinmetall's soft-recoil version of the M68A1. It held 19 ready rounds, plus 24 in hull storage.[98]

The autoloader is fed by a rotating 21-round magazine. The gunner selects the type of ammunition to be fired and the computer rotates the magazine to select the correct round accordingly.[109] Automatic and single-shot modes are available.[4] After firing, the gun returns to zero degrees elevation. The autoloader extracts the spent shell casing from the breech, then ejects the casing out of the turret through the same port used to load the autoloader. Once the autoloader has loaded the next round, the gun returns to the elevation of the last target. If the autoloader is disabled, the crew can load the AGS under armor at a rate of three rounds per minute.[109][57]

The gunner Hughes day/night thermal sight was stabilized.[98] The CCVL had a commander's independent thermal viewer, but this was later eliminated to save weight.[108][101]

The M35 fires all NATO-standard 105 mm caliber ammunition.[4] The planned targets for the AGS ranged from bunkers and other man-made structures to armored personnel carriers and light armored vehicles. The AGS has the potential to engage main battle tanks, but these more heavily armored vehicles are less likely to be the AGS's main targets.[110]

A Browning M2 12.7 mm (.50) caliber heavy machine gun is mounted in a manually operated pintle on the commander's hatch. Other possible weapons were a M240 7.62 mm caliber machine gun or an MK 19 40 mm grenade launcher.[95]


Miscellany


The AGS has a 1553 data bus. This is not present in the CCVL.[4]


Comparison of tanks


CCVL[94] M8 AGS[2] Vickers/FMC Mk 5[94] M551A1 Sheridan (TTS)[111] M1A1 Abrams[112]
Hull Length 244 in (6.197 m) 242 to 247 in (6.1 to 6.3 m) 244 in (6.2 m) 248 in (6.3 m) 312 in (7.9 m)
Width 106 in (2.692 m) 104 in (2.6 m) (over fenders) 106 in (2.69 m) 110 in (2.8 m) 144 in (3.7 m)
Height 92 in (2.349 m) (turret roof) 100 to 101 in (2.5 to 2.6 m) (over cupola) 103 in (2.62 m) (overall) 116 in (2.9 m) (over MG) 114 in (2.9 m) (over MG)
Ground Clearance 16 in (0.406 m) 15 to 17 in (38.1 to 43.2 cm) 16 in (0.41 m) 19 in (48.3 cm)
Top Speed 43 mph (70 km/h) 45 mph (72 km/h) 43 mph (70 km/h) 43 mph (69 km/h) 41.5 mph (67 km/h)
Fording 52 in (1.32 m) 40 in (1.0 m) 39 in (1.0 m) Floats 48 in (1.2 m) (w/o kit)
Max Grade 60 percent
Max Trench 7 ft 0 in (2.133 m) 7 ft (2.1 m) 7 ft 0 in (2.13 m) 8 ft (2.4 m) 9 ft (2.7 m)
Max Wall 30 in (0.762 m) 32 in (0.8 m) 30 in (0.76 m) 33 in (0.8 m) 49 in (1.2 m)
Range 300 mi (480 km) 350 mi (560 km) 289 mi (465 km)
Power 575 hp (429 kW) at 2400 rpm 550 hp (410 kW) at 2400 rpm (JP-8) 552 hp (412 kW) at 2300 rpm 300 hp (220 kW) at 2800 rpm 1,500 hp (1,100 kW) at 3000 rpm
Power-to-Weight Ratio 24.2 hp/ST (26.7 hp/t) 28.3 to 21.2 hp/ST (23.3 to 17.4 kW/t) 25.4 hp/ST (28 hp/t) 17.9 hp/ST (14.7 kW/t) 23.1 hp/ST (19.0 kW/t)
Torque N/A 1,446 lb⋅ft (1,960 N⋅m) at 1500 rpm N/A 615 lb⋅ft (830 N⋅m) at 2100 rpm 3,934 lb⋅ft (5,330 N⋅m) at 1000 rpm
Weight, Combat Loaded 42,801 lb (19,414 kg) 36,900 to 52,000 lb (16,740 to 23,590 kg) 43,541 lb (19,750 kg) 33,600 lb (15,240 kg) 130,000 lb (58,970 kg)
Ground Pressure 9.81 psi (0.69 kg/cm2) 9.1 to 12.2 psi (0.64 to 0.86 kg/cm2) 9.8 psi (0.69 kg/cm2) 6.9 psi (0.49 kg/cm2) 14.4 psi (1.01 kg/cm2)
Main Armament M68A1 105 mm gun M35 105 mm rifled 105 mm low recoil force gun M81E1 rifled 152 mm gun/launcher 120 mm M256 smoothbore
Elevation +20° / −10° (limited depression over rear arc) +19.5° / −8° +20° / −10°
Traverse Rate N/A 8.5 seconds/360° 9 seconds/360° 10 seconds/360° 9 seconds/360°
Elevation Rate N/A 11°/second N/A 4°/second 25°/second
Main Gun Ammo 43 (19 ready) 30 (21 ready) 41 (19 ready) 29 (including 9 missiles) 40
Firing Rate 12rds/minute N/A 4rds/minute 6rds/minute
Crew 3 (commander, gunner, driver) 4 (commander, gunner, loader, driver)
Protection All-welded aluminum hull and turret with bolt on steel composite armor 5083 aluminium alloy hull, armor arrays-reinforced turret Aluminum hull and turret with applique steel plates 7039 aluminium alloy hull, rolled homogeneous steel turret Rolled homogenous steel, with armor arrays in turret and hull

Variants


Using a magnet to determine which components of the CCVL are ferrous
Close Combat Vehicle Light

FMC began developing the Close Combat Vehicle Light as a private venture in 1983. The first prototype CCVL was completed in August 1985 and debuted at the meeting of the Association of the United States Army in October.[21]

M8 Armored Gun System

The AGS eliminated the commander's independent thermal viewer of the CCVL.[108][101] The Watervliet Arsenal M35 replaced the M68A1 gun.[4]

Vickers/FMC Mark 5 battle tank

In 1985 the British Vickers Defence Systems and FMC collaborated on a derivative of the CCVL intended for export customers. The prototype was completed in May 1986 and first publicly appeared later that year. The tank had a fourth crewmember in lieu of an autoloader. It was armed with a 105 mm low recoil force gun, and could accept a number of other 105 mm guns as well.[94]

An artist's impression of a LOSAT system firing from an AGS chassis[113]
An artist's impression of a LOSAT system firing from an AGS chassis[113]
Line of Sight Anti-Tank (LOSAT)

In 1994, Loral Vought Systems was awarded a contract worth up to $42.5 million ($77.7 million in 2021) to integrate the LOSAT missile onto an AGS chassis.[48] In lieu of the turret, a missile pod with 12 kinetic energy missiles was installed.[114] At least one full-scale mockup of the AGS LOSAT had been constructed by 1995. Delivery of the AGS LOSAT was scheduled for 1996.[113] After the cancelation of the AGS, the Army switched the chassis of the LOSAT to the Humvee.[115]

M8 Enhanced Capabilities Demonstrator/Thunderbolt

A single technology demonstrator built by United Defense and demonstrated in 2003.[116] The ECD had a hybrid electric drive instead of a diesel engine. The tracks were a rubber band type. Armament was an XM291 120 mm electrothermal-chemical smoothbore cannon fitted with an autoloader. A storage area in the rear could be used to carry up to four crew members or other equipment, such as additional ammunition.[93]

Lightning Bolt

In August 2004, BAE conducted live fire testing of the Lightning Bolt at Camp Roberts, California. Like the ECD, the Lightning Bolt incorporated a hybrid electric drive and XM291.[117]

120 Armored Gun System

BAE Systems debuted the AGS 120 in 2006. The chassis was based on the original M8 AGS but integrated the 120 mm gun and turret of the ECD/Thunderbolt.[93]

External media
Images
Photos of the BAE Mobile Protected Firepower prototype
An M8 Armored Gun System awaiting restoration at the Museum Support Center at Anniston
Video
Clip of MPF firing
Mobile Protected Firepower

BAE Systems entered an updated variant of the M8 in the U.S. Army Mobile Protected Firepower program.[87] According to BAE, the MPF variant is completely redesigned, keeping only the footprint (length, width and height). The new vehicle incorporated a new transmission and MTU powerpack, band composite rubber track and a new fire control system. BAE added improved underbody armor, as well as the Iron Fist active protection system and BAE's Terra Raven soft-kill system.[118]



The Close Combat Vehicle Light at the National Museum of Military Vehicles in 2020. Photos courtesy: Amazing Ace.


See also



Notes


  1. The "light tank" designation was unofficial.[1]
  2. An early mention of the "Buford" name appears in a speculative fictional account of the 2nd ACR in the 1994 Tom Clancy book Armored Cav – A Guided Tour of an Armored Cavalry Regiment, where it is said that the M8 is named after U.S. Army Civil War cavalry officer John Buford.[6]
  3. By 1985, the Army had about 800 Sheridans, 750 of which were in storage. The 82nd Airborne retained 50 in active service.[7]
  4. The Infantry School referred to the system as the Assault Gun while the Armor School favored the more "tank-like" title of Armored Gun.[18]
  5. Possible destinations for the 500 AGS sytems were the 82nd Airborne, the 9th Infantry Division (Motorized) or the 101st Airborne Division.[7]
  6. Pictures of the visual differences between the armor levels can be found in a work by R. P. Hunnicutt.[52]
  7. A similar-looking undated image of an AGS is described by Christopher F. Foss as having level 2 armor and explosive reactive armor[93]

References


  1. Hunnicutt 2015a, p. 288.
  2. Hunnicutt 2015a, p. 310.
  3. Miller, David Maxwell Owens (2000). The Illustrated Directory of Tanks of the World. London: Salamander. pp. 478–480. ISBN 1840651768. Retrieved March 7, 2022.
  4. Foss, Christopher F., ed. (1995). "Light Tanks". Jane's Armour and Artillery (16th ed.). London: Janes Information Group. pp. 167–169. ISBN 978-0710612601.
  5. Miller, Stephen W. (March 2016). "Light Vehicles With Big Punch". Military Technology. Moench Publishing Group.
  6. Clancy, Tom (1994). Armored Cav: A Guided Tour of an Armored Cavalry Regiment. New York, New York: Berkley Books. p. 283. ISBN 0-425-15836-5. Retrieved October 5, 2022.
  7. "Army Official Urges Purchase of 500 Light Tanks". St. Louis Post-Dispatch. UPI. December 23, 1985. Retrieved October 18, 2022.
  8. Zaloga 2009, p. 35–38.
  9. Hunnicutt 2015a, p. 165.
  10. Freeman 1991, p. 13.
  11. Bowman, Kendall & Saunders 1989, p. 13.
  12. Bowman, Kendall & Saunders 1989, p. 14–15.
  13. Bowman, Kendall & Saunders 1989, p. 5–6.
  14. Bowman, Kendall & Saunders 1989, p. 101–102.
  15. Foss, Christopher F., ed. (1985). "Light Tanks". Jane's Armour and Artillery (6th ed.). London: Jane's Publishing Group. p. 152. ISBN 978-0710608208.
  16. Zaloga 2009, p. 44–45.
  17. Freeman 1991, p. 12–14.
  18. Freeman 1991, p. 16.
  19. Loughlin, Don (July–August 1998). "Sayonara AGS! Sayonara Scout? Sayonara Armor?" (PDF). Armor: 37. Retrieved June 1, 2022.
  20. Freeman 1991, p. 14.
  21. Foss, Christopher F., ed. (1987). "Light Tanks". Jane's Armour and Artillery 1987–1988 (8th ed.). Jane's Publishing Group. pp. 155–158, 163. ISBN 0 7106-0849-7.
  22. Hunnicutt 2015a, p. 176.
  23. Zaloga, Steven J. (1984). US Light Tanks 1944–84. London: Osprey Publishing Ltd. pp. 24, 25. ISBN 0-85045-541-3.
  24. Zaloga 2009, p. 43.
  25. Hunnicutt 2015a, p. 175.
  26. Freeman 1991, p. 15.
  27. Preston 2004, p. 28.
  28. Hinton, Henry; Shafer, F. James; Gaston, Lawrence (July 1991). Armored Systems Modernization: Program Inconsistent With Current Threat and Budgetary Constraints (PDF) (Report). Government Accounting Office. p. 12. Retrieved February 21, 2022. This article incorporates text from this source, which is in the public domain.
  29. "Army Plans to Form Three Units That Will Feature Armored Gun System". Inside the Pentagon. Vol. 7, no. 46. Inside Washington Publishers. November 14, 1991. pp. 3–4. JSTOR 43987581.
  30. Hunnicutt 2015a, p. 183.
  31. Edwards III, Major O.T. (January–March 1995). "TRADOC System Manager For Abrams and the AGS Comments on "Assault Gun Battalion 96"" (PDF). Armor: 49. Retrieved March 23, 2022.
  32. Foote, Sheila (October 31, 1995). "Army okays initial production of Armored Gun System". Defense Daily. Access Intelligence. Retrieved August 5, 2022.
  33. "Army, Marine Corps Told to Join Forces and Develop New Armored Vehicle". Inside the Pentagon. Vol. 7, no. 30. Inside Washington Publishers. July 25, 1991. p. 5. JSTOR 43987311.
  34. "Marines reject Hill advice on LAV-105 turret; SASC and HASC support common turret". Defense Daily. Vol. 172, no. 28. Access Intelligence. August 8, 1991. Retrieved August 5, 2022.
  35. Richard, Lardner (March 2, 1992). "Service Emphasizes Lighter Forces: in New World, Armored Gun System Ranks as Army's Top Procurement Priority". Inside the Pentagon. Vol. 8, no. 11. Inside Washington Publishers. pp. 1, 11–13. JSTOR 43987842.
  36. "Senate Appropriators Say: Army Does Not Have Funding to Follow Through With Force Modernization Plans". Inside the Pentagon. Vol. 7, no. 39. Inside Washington Publishers. September 26, 1991. p. 12. JSTOR 43989173.
  37. Freeman 1991, p. 1.
  38. Wank 1993, p. 23–24.
  39. Wank 1993, p. 27–28.
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  41. Wank 1993, p. 35.
  42. "The Contenders: Four Teams Compete for Armored Gun System Contract". Inside the Pentagon. Vol. 8, no. 11. Inside Washington Publishers. March 12, 1992. p. 12. JSTOR 43987850.
  43. Hunnicutt 2015a, p. 182.
  44. "Army's AGS Will Be Based on Existing Platform, 'Air-Droppable' From C-17". Inside the Pentagon. Vol. 7, no. 15. Inside Washington Publishers. April 11, 1991. JSTOR 43987017.
  45. "Armored Gun System Loses Weight to Be Deployed by C-130". Inside the Pentagon. Vol. 9, no. 31. Inside Washington Publishers. August 5, 1993. JSTOR 43990667.
  46. "Transportability of Major Weapon and Support Systems" (PDF). DoD Office of the Inspector General. December 27, 1993. Retrieved January 15, 2020.
  47. Dupont, Daniel G. (January 31, 1994). "Army Refutes DoD IG Claim That AGS Airdrop Mission May Be Ignored". Inside the Army. Vol. 6, no. 5. Inside Washington Publishers. pp. 1, 17–18. JSTOR 43975837.
  48. "Army Successfully Drops Armored Gun System From C-130 at Yuma". Inside the Army. Vol. 6, no. 43. Inside Washington Publishers. October 24, 1994. pp. 6–7. JSTOR 43976759.
  49. Dupont, Daniel G. (November 15, 1993). "SADARM, MLRS Slipped: Army's POM Shows Planned Buy of Armored Gun Systems Is Cut by 77". Inside the Army. Vol. 5, no. 46. Inside Washington Publishers. pp. 1, 17–19. JSTOR 43975649.
  50. "82nd Airborne to Be Equipped in FY-97: Program Overhaul Accelerates AGS Production Schedule by Two Years". Inside the Army. Vol. 6, no. 33. Inside Washington Publishers. August 15, 1994. pp. 6–7. JSTOR 43976559.
  51. "Decker Lauds 'Model of Streamlined Acquisition': Six-Year Armored Gun System Cost-Cutting Plan Could Save $490 Million". Inside the Army. Vol. 7, no. 50. Inside Washington Publishers. December 18, 1995. pp. 3–4. JSTOR 43982560.
  52. Hunnicutt 2015a, p. 183–186.
  53. Eagles, Cynthia (May 1, 1995). "This Gun for Hire: Prototype of Weapon Reaches Fort Knox". The Courier Journal. Retrieved January 15, 2020.
  54. Zaloga 2009, p. 46.
  55. "Armored Gun System Completes Early User Tests, Clearing Way for LRIP". Inside the Army. Vol. 7, no. 31. Inside Washington Publishers. August 7, 1995. p. 3. JSTOR 43978398.
  56. Sherman, Jason (September 25, 1995). "National Guard Expressing Interest in System: Army Considering Reducing or Terminating Armored Gun System Purchase". Inside the Army. Vol. 7, no. 38. pp. 1, 8–9. JSTOR 43978524.
  57. Foss, Christopher F., ed. (1997). "Light Tanks". Jane's Armour and Artillery (18th ed.). London: Jane's Publishing Group. pp. 171–173. ISBN 978-0710615428.
  58. Preston 2004, p. 12–14.
  59. "DoD Allots $39 Billion for Procurement in FY-96, Lowest Level Since 1950". Inside the Pentagon. Inside Washington Publishers. February 6, 1995. JSTOR 43990396. Retrieved September 18, 2022.
  60. Dupont, Daniel G. (February 15, 1996). "Anti-Armor Review Could Lead to More Cuts: Canceling Armored Gun System Only One Step Toward Modernization Fix". Inside the Army. Vol. 8, no. 5. Inside Washington Publishers. JSTOR 43978852. Retrieved September 18, 2022.
  61. Cameron, Robert S. (March 11, 1998). 1996 Annual Command History (PDF) (Report). United States Army Armor Center and Fort Knox. pp. 111–112. Retrieved February 21, 2022. This article incorporates text from this source, which is in the public domain.
  62. Sherman, Jason (February 12, 1996). "Service Still Seeking OSD Support: Army's Decision to Terminate AGS Meets Stiff Resistance on Capitol Hill". Inside the Army. Vol. 8, no. 6. Inside Washington Publishers. pp. 1, 9–10. JSTOR 43982648.
  63. "Army Termination Decision Still Unannounced: Lawmakers Urge Perry to Fully Fund Armored Gun System in 1997 Budget". Inside the Army. Inside Washington Publishers. January 29, 1996. pp. 1, 16. JSTOR 43978837. Retrieved September 18, 2022.
  64. Sherman, Jason (February 19, 1996). "With Congress Out of Session . . .: OSD Holding Up AGS Termination Announcement; JROC Backs Army Decision". Inside the Army. Vol. 8, no. 7. Inside Washington Publishers. JSTOR 43978916. Retrieved September 18, 2022.
  65. Arenstein, Seth (March 4, 1996). "AGS killed as Army budget rises". Defense Daily. Vol. 190, no. 42. Access Intelligence. Retrieved August 5, 2022.
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  68. Sherman, Jason (July 15, 1996). "Reimer Wants Little Disruption for Soldiers: Without AGS, Army Plans to Phase Out Its Sole Light Armored Battalion". Inside the Army. Vol. 8, no. 28. Inside Washington Publishers. pp. 1, 7. JSTOR 43982760. Retrieved August 6, 2022.
  69. "Army Considers Speeding Javelin Fielding to Unit Affected by AGS Kill". Inside the Army. Vol. 8, no. 14. Inside Washington Publishers. April 8, 1996. JSTOR 43982527. Retrieved August 6, 2022.
  70. Winograd, Eric Q. (May 18, 1998). "Enhanced Fiber-optic Guided Missile Killed in House, Senate Bills". Inside the Army. Vol. 10, no. 19. Inside Washington Publishers. p. 5. JSTOR 43981279. Retrieved August 6, 2022.
  71. Dupont, Daniel G. (July 28, 1997). "Panel Accuses Service of Misusing ACTD Concept: Army's Plans to Replace AGS With EFOG-M, LOSAT Under Fire in Congress". Inside the Army. Vol. 9, no. 30. Inside Washington Publishers. pp. 1, 10–12. JSTOR 43980251. Retrieved August 6, 2022.
  72. "Future KE Missile Road Map Under Development: Army Evaluates Plans for Kinetic-energy Weapons After LOSAT Kill". Inside the Army. Vol. 17, no. 18. Inside Washington Publishers. May 9, 2005. pp. 1, 8. JSTOR 24823265. Retrieved August 6, 2022.
  73. Dupont, Daniel G. (May 18, 1998). "Armored Gun System May Get (Limited) New Life". Inside the Army. Vol. 10, no. 19. Inside Washington Publishers. p. 7. JSTOR 43981282.
  74. Burger, Kim (October 9, 2000). "IAV Source Selection May Come This Week: Chosen Vehicle Less Important Than New Concept, Observers Say". Inside the Army. Vol. 12, no. 40. Inside Washington Publishers. pp. 7–9. JSTOR 43985072.
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Bibliography





На других языках


[de] M8 Armored Gun System

Das M8 Armored Gun System (AGS) (engl.: M8 gepanzertes Waffensystem) ist ein leichter Panzer, der als Ersatz für den M551 Sheridan bei der 82. US-Luftlandedivision konzipiert wurde. Er sollte außerdem die mit TOW bewaffneten HMMMV M966 beim 2. US-Kavallerieregiment ersetzen.
- [en] M8 Armored Gun System

[ru] M8 (танк)

105mm Armored Gun System (AGS), M-8 — опытный лёгкий авиадесантный танк США 1980-х годов. Разрабатывался с начала 1980-х годов фирмой FMC в инициативном порядке. На вооружение в США M-8 принят так и не был из-за сокращения финансирования в 1990-х годах, а его авиадесантная специализация не позволила наладить экспортные поставки, поскольку в роли обычного лёгкого танка он уступал разрабатанному в то же время «Стингрею». Все работы по танку были прекращены к 1996 году.



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