The High Mobility Multipurpose Wheeled Vehicle ( HMMWV; colloquial: Humvee) is a family of light, four-wheel drive military trucks and utility vehicles produced by AM General. It has largely supplanted the roles previously performed by the Willys MB, and others such as the Vietnam War-era M151 Jeep, the M561 "Gama Goat", their M718A1 and M792 ambulance versions, the Commercial Utility Cargo Vehicle, and other light trucks. Primarily used by the United States military, it is also used by numerous other countries and organizations and even in civilian adaptations.
The Humvee saw widespread use in the Gulf War of 1991, where it navigated the desert terrain; this usage helped to inspire civilian Hummer versions. The vehicle's original unarmored design was later seen to be inadequate and was found to be particularly vulnerable to improvised explosive devices in the Iraq War. The U.S. hastily up-armored select models and replaced frontline units with the MRAP. Under the Joint Light Tactical Vehicle (JLTV) program, in 2015 the U.S. Army selected the Oshkosh L-ATV to replace the vehicle in frontline U.S. military service.
By the mid-1960s, the U.S. military felt a need to reevaluate their aging light vehicle fleet. From the mid-1960s, the U.S. Army had tried to modernize, through replacing the larger, purpose-built Dodge M37s by militarized, "commercial off the shelf" (COTS) 4×4 trucks — initially the M715 Jeep trucks, succeeded in the later 1970s by several "CUCV" adapted commercial pickup series, but these did not satisfy newer requirements either. What was wanted was a truly versatile light military truck, that could replace multiple outdated vehicles. When becoming aware of the U.S. Army's desire for a versatile new light weapons carrier/reconnaissance vehicle, as early as 1969 FMC Corporation started development on their XR311 prototype and offered it for testing in 1970. At least a dozen of these were built for testing under the High Mobility Combat Vehicle, or HMCV program, initially much more as an enhanced capability successor to the M151 jeep, than as a general-purpose vehicle.
The HMMWV program had its origins in the Combat Support Vehicle (CSV) program. The XM966 CSV was a proposed platform for the TOW missile launcher. Congress ended the program in 1977 due to the relatively small requirement of 3,800 vehicles. Adjusting to Congress's expectations, the Army increased the scale of the program, then called the XM966 High Mobility Weapons Carrier (CSVP), to replace multiple other trucks. Congress, interested in a larger joint services truck program, removed the CSVP from the 1979 budget. The Army restructured the program, which was then called High Mobility Multipurpose Wheeled Vehicle.
In 1979, the U.S. Army released draft specifications for the High Mobility Multipurpose Wheeled Vehicle (HMMWV), which was to replace all U.S. Army tactical vehicles in the 1/4-ton to 5/4-ton range, HMMWV Background amgeneral.com. Retrieved on 2015-01-27 As well as select vehicles in the U.S. Marine Corps and U.S. Air Force. Namely these were the M151 quarter-ton jeeps, Gama Goat, and the CUCVs, as one uniform "jack-of-all-trades" light tactical vehicle series, to better perform the roles of the impractically mixed fleet of outdated existing vehicles. The specifications called for a diesel engine, excellent on and Off-roading performance, the ability to carry a large payload, and improved survivability against indirect fire.Pat Ware The changing role of the Humvee . Telegraph, 2014-03-14. Retrieved 2015-01-27 Compared to the jeep, it was larger and had a much wider track, with a ground clearance, double that of most sport-utility vehicles. The new truck was to climb a 60 percent incline and traverse a 40 percent slope and ford of water and electronics waterproofed to drive through of water were specified. The radiator was to be mounted high, sloping over the engine on a forward-hinged hood.
Out of 61 companies that showed interest in the contract, five companies submitted proposals before the deadline in April 1981. In July 1981, the Army awarded contracts to three companies—AM General, Chrysler Corporation, and Teledyne Continental—to build eleven HMMWV prototypes each. The vehicles (six weapon carriers and five utility vehicles) were delivered by May 1982.
The Teledyne HMMWV was based on the rear-engined XR311 Cheetah. Chrysler's HMMWV was based on the Expanded Mobility Truck. Chrysler Defense was sold mid-competition to General Dynamics Land Systems. The AM General HMMWV was developed as a private venture to meet the HMMWV requirement. The first prototype (a weapons carrier variant) was completed in August 1980 and sent to the Nevada Automotive Test Center for testing. AM General nicknamed the prototypes it delivered for the Army competition "Hummer," which AM General had the foresight to trademark.
The vehicles underwent testing at Aberdeen Proving Ground, Maryland and Yuma, Arizona. The vehicles were subjected to over 600,000 miles in trials which included off-road courses in desert and arctic conditions. On March 22, 1983, AM General was awarded the contract. The vehicle's durability and light weight were factors that led to its selection. Production kicked off in April 1984 at AM General's plant in Mishawaka, Indiana and the first Humvees entered service by 1985. AM General was awarded an initial contract for 2,334 vehicles, the first batch of a five-year contract that would see 55,000 vehicles delivered to the U.S. military, including 39,000 vehicles for the Army. 72,000 vehicles had been delivered to the U.S. and foreign customers by the Persian Gulf War of 1991, and 100,000 had been delivered by the Humvee's 10th anniversary in 1995. Ft. Lewis, Washington, and the 2nd Battalion, 47th Infantry, 9th Infantry Division was the testing unit to employ HMMWV in the new concept of a motorized division. Yakima Training Center, Washington, was the main testing grounds for HMMWVs from 1985 through December 1991, when the motorized concept was abandoned and the division inactivated.
In June 1983, a Pentagon report noted the vehicle's "very low" reliability, averaging 370 miles between failures.
In August 1989, AM General was awarded a $1 billion contract from the Army to produce 33,000 HMMWVs.
After Operation Restore Hope in Somalia, the military recognized a need for a more protected HMMWV. AM General developed the M1114, an armored HMMWV to withstand small arms fire. The M1114 has been in production since 1996, seeing limited use in the Balkans before deployment to the Middle East. This design is superior to the M998 with a larger, more powerful turbocharger engine, air conditioning, and a strengthened Car suspension system. More importantly, it has a fully Vehicle armour passenger area protected by hardened steel and bullet-resistant glass. With the increase in direct attacks and asymmetric warfare in Iraq War, AM General diverted the majority of its manufacturing power to producing these vehicles.
Humvees were sent into Afghanistan following the September 11 attacks, where they proved invaluable during initial operations. In the early years before IEDs became prevalent, the vehicle was liked by troops for its ability to access rough, mountainous terrain. Some soldiers would remove features from Humvees, including what little armor it had and sometimes even entire doors, to make them lighter and more maneuverable for off-road conditions and to increase visibility. With the onset of the Iraq War, Humvees proved very vulnerable to IEDs; in the first four months of 2006, 67 U.S. troops died in Humvees. To increase protection, the U.S. military hastily added armor kits to the vehicles. Although this somewhat improved survivability, bolting on armor made the Humvee an "ungainly beast", increasing weight and putting a strain on the chassis, which led to unreliability. Armored doors that weighed hundreds of pounds were difficult for troops to open, and the newly armored turret made Humvees top-heavy and increased the danger of Vehicle rollover. The U.S. Marine Corps decided to start replacing Humvees in combat with Mine-Resistant, Ambush-Protected (MRAP) vehicles in 2007, and the U.S. Army stated that the vehicle was "no longer feasible for combat" in 2012. However, Humvees have also been used by Taliban insurgents for car bomb against the Afghan National Security Forces in the country.
The HMMWV has become the vehicular backbone of U.S. forces around the world. Over 10,000 HMMWVs were employed by coalition forces during the Iraq War. The Humvee has been described as a vehicle with "the right capability for its era": designed to provide payload mobility in protected (safe) areas. However, deploying the vehicle to conflict zones where it was exposed to a full spectrum of threat which it was neither designed to operate, or be survivable in, led to adding protection at the cost of mobility and payload.
On 22 April 2022, Pentagon Press Secretary John F. Kirby described a package of military equipment being transported to Ukraine to assist in its war with Russia, including "100 armored Humvee vehicles". An additional 50 were promised on 19 August 2022, and were delivered at an unknown date. A number of Humvees were used in the assault on the Russian oblast of Belgorod Oblast on 22 May 2023. Ukraine first received Humvees from the U.S. in 2001, and they were used by them in peacekeeping operations in Kosovo that same year.
Most up-armored HMMWVs hold up well against lateral attacks when the blast is distributed in all different directions but offer little protection from a mine blast below the truck, such as buried IEDs and . Explosively formed penetrators (EFPs) can also defeat the armor kits, causing casualties.
The armor kits fielded include the Armor Survivability Kit (ASK), FRAG 5, FRAG 6, as well as upgrade kits to the M1151. The ASK was the first fielded in October 2003, adding about to the weight of the vehicle. Armor Holdings fielded an even lighter kit, adding only to the vehicle's weight. The Marine Armor Kit (MAK), fielded in January 2005, offers more protection than the M1114 but also increases weight. The FRAG 5 offered even more protection but was still inadequate to stop EFP attacks. The FRAG 6 kit is designed to do just that, however its increased protection adds over the vehicle over the FRAG 5 kit, and the width is increased by . The doors may also require a mechanical assist device to open and close.
Another drawback of the up-armored HMMWVs occurs during an accident or attack, when the heavily armored doors tend to jam shut, trapping the troops inside. As a result, the U.S. Army Aviation and Missile Research, Development, and Engineering Center developed the Humvee Crew Extraction D-ring in 2006. The D-ring hooks on the door of the HMMWV so that another vehicle can rip the door off with a tow strap, chain, or cable to free the troops inside. The D-ring was later recognized as one of the top 10 greatest Army inventions of 2006. In addition, Vehicle Emergency Escape (VEE) windows, developed by BAE Systems, were fielded for use on the M1114 up-armored HMMWV, with 1,000 kits ordered.
The soldier manning the exposed crew-served weapon on top of the vehicle is extremely vulnerable. In response, many HMMWVs have been fitted with basic gun shields or gun turret, as was the case with M113 APCs after they were first deployed in Vietnam. The U.S. military is currently evaluating a new form of protection, developed by BAE Systems as well as systems designed by the Army, which are already in theater. The new gunner's seat is protected by high steel plates with bulletproof glass windows. Additionally, some HMMWVs have been fitted with a remotely operated CROWS weapon station, which slaves the machine gun to controls in the back seat so it can be fired without exposing the crew. The Boomerang anti-sniper system was also fielded by some HMMWVs in Iraq to immediately give troops the location of insurgents firing on them.
Another weakness for the HMMWV has proven to be its size, which limited its deployment in Afghanistan because it is too wide for the smallest roads and too large for many forms of air transport compared to jeeps or Land Rover-sized vehicles (which are, respectively, 24 and 15 inches narrower). This size also limits the ability of the vehicle to be manhandled out of situations.
The U.S. Marine Corps issued a request for proposals in 2013 for its Humvee sustainment modification initiative to upgrade 6,700 expanded capacity vehicles (ECVs). The Marines plan to field the JLTV but do not have enough funding to completely replace all Humvees, so they decided to continue sustaining their fleet. Key areas of improvement include upgrades to the suspension to reduce the amount of force transferred to the chassis, upgrading the engine and transmission for better fuel efficiency, enhancements to the cooling system to prevent overheating, a central tire inflation system to improve off-road mobility and ride quality, and increased underbody survivability. Testing of upgraded Humvees was to occur in 2014, with production and installation occurring from 2015 through 2018. Older A2 series Humvees make up half the current fleet, and 4,000 are to be disposed of through foreign military sales and transfers. By 2017, the Marines' light tactical vehicle fleet is to consist of 3,500 A2 series Humvees, 9,500 ECV Humvees, and 5,000 JLTVs, with 18,000 vehicles in total. Humvees in service with the Marine Corps will be upgraded through 2030. Marine Humvee Upgrade Seen as Inevitable – Nationaldefensemagazine.org, February 2013 The Marines shelved the Humvee modernization effort in March 2015 because of budget cuts. Marines Shelve Humvee Upgrades Due to Budget Cuts – DoDBuzz.com, 20 March 2015
Several companies are offering modifications to maintain the remaining U.S. military Humvee fleets. Oshkosh Corporation is offering Humvee upgrades to the Marine Corps in addition to its JLTV offering, which are modular and scalable to provide varying levels of capabilities at a range of prices that can be provided individually or as complete packages. Their approach is centered around the TAK-4 independent suspension system, which delivers greater offroad profile capability, improved ride quality, an increase in maximum speed, greater whole-vehicle durability, and restored payload capacity and ground clearance. Oshkosh Defense Answers USMCs' Light Vehicle Needs – ASDnews.com, 2013-09-24 Northrop Grumman developed a new chassis and powertrain for the Humvee that would combine the mobility and payload capabilities of original vehicle variants while maintaining the protection levels of up-armored versions. The cost to upgrade one Humvee with Northrop Grumman's features is $145,000. Northrop Grumman Pitching New Humvee Chassis to Army – Nationaldefensemagazine.org, 2014-10-07Richard Sisk Northrop Offers Back-to-the-Future Upgrade to Humvee Fleet – Military.com, 2014-10-14 Textron has offered another Humvee upgrade option called the Survivable Combat Tactical Vehicle (SCTV) that restores mobility and survivability over armored Humvee levels. Although the SCTV costs more at $200,000 per vehicle, the company claims it can restore the Humvee for operational use, combining Humvee-level mobility and transportability with MRAP-level underbody protection as a transitional solution until the JLTV is introduced in significant numbers. Textron offers armoured HMMWV solution – Shephardmedia.com, 2014-10-15 Textron Land Systems presented Survivable Combat Tactical Vehicle System at AUSA 2014 – Armyrecognition.com, 21 October 2014
One suggested future role for the Humvee is as an autonomous unmanned ground vehicle (UGV). If converted to a UGV, the vehicle could serve as a mobile scout vehicle with armor features removed to enhance mobility and terrain accessibility, since there would be no occupants needing protection. Because there will still be tens of thousands of Humvees in the U.S. inventory after the JLTV enters service, it could be a low-cost way to build an unmanned combat vehicle fleet. Autonomy features would allow the Humvees to drive themselves and one soldier to control a "swarm" of several vehicles.
Although the Army plans to buy 49,100 JLTVs and the Marine Corps 5,500, they are not a one-for-one replacement for the Humvee, and both services will still be left operating large fleets. For the Marines, 69 JLTVs will replace the 74 Humvees in all active infantry battalions to cover its expeditionary forces. The Marine JLTV order is planned to be completed by 2022, leaving the remainder of the Corps' 13,000-strong Humvee force scattered around support organizations while soft-skinned Humvees will provide support behind the forward-deployed Marine Expeditionary Unit. The Army does not plan to replace Humvees in the Army National Guard and is considering options on how many of its 120,000 vehicles will be replaced, sustained, or modernized. Even if half of the force is replaced by JLTVs, the entire planned order will not be complete until 2040. If upgrades are chosen for the remaining Humvees, the cost would likely have to not exceed $100,000 per vehicle. Oshkosh Awaits Protests After JLTV Win – Defensenews.com, 29 August 2015 The Humvee is expected to remain in U.S. military service until at least 2050. AM General Secures Six-Year, $428.3 Million Contract To Provide The Army With M997A3 HMMWV Configured Ambulances – PRNewswiew.com, 8 September 2015 Ambulance variants of the Humvee will especially remain in active use, as the JLTV could not be modified to serve as one due to weight issues. Pentagon Selects 1st Army, Marine Units to Receive JLTV – Military.com, 14 June 2017
On April 30, 2025, US Secretary of Defense Pete Hegseth ordered the Secretary of the Army to "end procurement of obsolete systems, and cancel or scale back ineffective or redundant programs, including manned aircraft, excess ground vehicles (e.g., HMMWV), and outdated UAVs". The Army said it would stop procuring Humvees and JLTVs. AM General said it would continue producing the vehicles, and it was unclear whether existing contracts would be cancelled.
The Humvee uses V8 powertrains from General Motors and General Engine Products (GEP), a wholly owned subsidiary of AM General. Early iterations were issued with General Motors' 6.2-liter Detroit Diesel V8. Later iterations were fitted with the larger and improved 6.5-liter Detroit Diesel V8. Power output for the naturally-aspirated version of this engine is and of torque, while the turbocharged version produces and . GEP uses a modified version of the 6.5-liter Detroit Diesel V8 called the Optimizer 6500. This engine features improvements for better long-term reliability and has a power output of and of torque.
The vehicle has double wishbone suspension with Portal axle on all 4 wheels and inboard . The brake discs are not mounted at the wheels, as on conventional cars, but are inboard of the half-shafts, attached outboard of the differentials. The front and rear differentials are Torsen type, and the center differential is of the lockable type. Torque-biasing differentials allows forward movement as long as at least one wheel has traction. It runs on specialized 37 × 12.5 radial tires with low-profile Runflat tire devices. Newer HMMWV versions can be equipped with a central tire inflation system (CTIS) kit in the field. While it is optimized for off-road mobility, it can achieve at maximum weight with a top speed of .Luiz, Gerald. "Military HMMWV" . Off-road.com, 1 April 2002.
HMMWVs are well suited for airmobile operations as they are transportable by C-130 or larger combat transports, droppable by parachute, and can be sling-loaded from helicopters, though there are smaller vehicles such as the Growler which were designed to fit into smaller craft such as the V-22. In combat conditions, the HMMWV can be delivered by the Low Altitude Parachute Extraction System which pulls the vehicle out of the open rear ramp just above the ground without the aircraft having to land.
There are at least 17 variants of the HMMWV in service with the U.S. military. HMMWVs serve as cargo/troop carriers, automatic weapons platforms, (four litter patients or eight ambulatory patients), M220 TOW missile carriers, M119 howitzer prime movers, M1097 Avenger Pedestal Mounted Stinger platforms, MRQ-12 direct air support vehicles, S250 shelter carriers, and other roles. The HMMWV is capable of normally, or with the deep-water fording kits installed.
Optional equipment includes a winch (maximum load capacity and supplemental armor. The M1025/M1026 and M1043/M1044 armament carriers provide mounting and firing capabilities for the M134 Minigun, the Mk 19 grenade launcher, the M2 heavy machine gun, the GAU-19A/B gatling gun, the M240G/B machine gun and M249 SAW.
The M1114 "up-armored" HMMWV, introduced in 1996, also features a similar weapons mount. In addition, some M1114 and M1116 up-armored and M1117 armored security vehicle models feature a Common Remotely Operated Weapon Station (CROWS), which allows the gunner to operate from inside the vehicle, and/or the Boomerang anti-sniper detection system. Recent improvements have also led to the development of the M1151 model, which quickly rendered the previous models obsolete. By replacing the M1114, M1116, and earlier armored HMMWV types with a single model, the U.S. Army hopes to lower maintenance costs.
The latest iteration of the Humvee series can be seen in the M1151A1 and later up-armored A1-versions. It has a stronger suspension and larger 6.5 liter turbo-diesel engine to accommodate the weight of up to of additional armor. The armor protection can be installed or taken off depending on the operating environment, so the vehicles can move more efficiently without armor when there is no threat of attack. There is some underbody armor that moderately protects against mines and roadside bombs. Other improvements include Vehicle Emergency Escape (VEE) windows that can be quickly removed so troops inside can escape in the event of a rollover, jammed door, or the vehicle catching fire, and a blast chimney that vents the force of a bomb blast upwards and away from the occupants. The M1151A1 has a crew of four, can carry of payload, and can tow a load. On roads, it has a top speed of and a range of . The HMMWV Built For Hard Time – Strategypage.com, 30 May 2014
In late 1995, the production of the M1114 based on the improved ECV chassis began. The M1114 meets Army requirements for a scout, military police, and explosive ordnance disposal vehicle with improved ballistic protection levels. The M1114 provides protection against 7.62 mm armor-piercing projectiles, 155 mm artillery air bursts and anti-tank mine blasts.
In June 1996, the U.S. Army purchased an initial 390 M1114s for operations in Bosnia. The U.S. Air Force has several M1114 vehicles that differ in detail from the U.S. Army model. Under the designation M1116, the type was specifically designed and tailored to the needs of the U.S. Air Force. The M1116 features an expanded cargo area, armored housing for the turret gunner, and increased interior heating and air conditioning system. The M1114 and M1116 received armor at O'Gara-Hess & Eisenhardt Armoring Company of Fairfield, Ohio. The M1145 offers the protection of the M1114 and M1116 for Air Force Air Support Operations Squadrons (ASOS). Designed to protect Forward Air Controllers, modifications include perimeter ballistic protection, overhead burst protection, IED protection, mine blast protection, and 'white glass' transparent armor. HMMWV in Scale – Hmmwvinscale.com Before the introduction of the latest armored HMMWV variants, and between 1993 and June 2006, Armor Holdings produced more than 17,500 armored HMMWVs (more than 14,000 between 2003 and 2007), all but about 160 of the earliest models were M1114, with smaller numbers of M1116 and M1045. The extended capacity HMMWVs, such as the M1165 can drive over an vertical wall and carry a payload.
Work began on the SCTV in 2008 in anticipation of U.S. military upgrades, but it was shelved once they made the JLTV a priority. Textron then focused on selling the SCTV upgrade package to up to 25 countries operating the global fleet, a potential market of up to 10,000 vehicles. The upgrade can enhance the survivability of previously soft-skinned versions, sometimes sold by the U.S. as Excess Defense Articles, while costing and weighing less than a comparable MRAP. By 2015, Colombia had installed the SCTV into three Humvees for testing, and Ukraine had shown interest in upgrading their old-model Humvees recently supplied by the U.S. Textron Shops Protective Humvee ‘Capsules’ Abroad – DoDBuzz.com, 14 October 2015 Ukraine ordered three SCTVs in February 2016.
In Australia, a Gold Coast-based company called Rhino Buggies produces replicas of the Hummer H1 based on the Nissan Patrol 4WD vehicle for around A$30,000.Rhino Buggies web site http://www.rhinobuggies.com.au/
In the U.S., four companies offered Hummer-look-alike body kits that can be mated to GM full-size trucks and Suburban chassis and, in some cases, Ford, Dodge, and Cadillac applications. Some models are Urban Gorilla, Urban Gorilla from Urban Manufacturing. 4x4bodies.com Endeavor SB400 and SB4x400 from Forever Off-Road, the Jurassic Truck Corporation T-Rex, and the Bummer from Tatonka Products. An additional company offers plans for chassis building. The kits range from two-door fiberglass models to steel tube and sheet metal constructions.
Variants
Major HMMWV A0/A1/A2 versions
M1113 expanded capacity vehicle (ECV)
International versions
Survivable Combat Tactical Vehicle
Operators
Former user
Non-state actors
Civilian sales
HUMVEE C-Series
Replicas
Similar vehicles
See also
Bibliography
External links
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