Army had determined that a TOW needed a 3-man team to operate it. The DPVs could only carry a two-man crew and they seemed perfectly capable of operating the TOW, but this would have meant revising Army doctrine and possibly changing TOW deployment throughout the Army. Fort Benning decided to offer a "superior" DPV design that allowed a third crewman. This design was rejected by the HTLD team and was never produced. The basic weapons on a DPV consist of a heavy .50 caliber M2 Browning machine gun, two lighter 7.62×51mm M60 machine guns, and two M136 AT4 anti-armor weapons. In some cases, the driver's M60 or the gunner's M2 is replaced with a 40 mm Mk 19 grenade launcher. Other light machine guns such as the M240 machine gun or 5.56×45mm M249 SAW can also be mounted. Similar US equipment The United States Marines Corps also fielded a Fast Attack Vehicle – a completely different piece of equipment based on the venerable M151 1/4-ton. This FAV stayed in use long after the fielding of the HMMWV because it could fit on Marine Corps helicopters while the wider HMMWV could not. In 1999, this FAV began to be replaced with the Interim Fast Attack Vehicle (IFAV) a version of the Mercedes-Benz MB 290 GD 1.5 ton truck. See also Kojak (vehicle) Light Strike Vehicle Chenowth Advanced Light Strike Vehicle Long Range Desert Group ULTRA AP Willys FAMAE Corvo VLEGA Gaucho/Chivunk Fabrique Nationale AS 24 Light Strike Vehicle (Singapore) Saker LSV Notes and references Soft-skinned vehicles Military vehicles of the United States Military light utility vehicles Military vehicles introduced in the 1980s