The Expeditionary Fighting Vehicle (EFV) (formerly known as the Advanced Amphibious Assault Vehicle (AAAV)) was an amphibious assault vehicle developed by General Dynamics during the 1990s and 2000s for use by the U.S. Marine Corps. It would have been launched at sea, from an amphibious assault ship beyond the horizon, able to transport a full Marine rifle squad to shore. It would maneuver cross country with an agility and mobility equal to or greater than the M1 Abrams.

The EFV, designed by General Dynamics Land Systems, was an amphibious armored tracked vehicle with an aluminum hull. The engine is a custom MTU Friedrichshafen diesel (MT883) with two modes of operation; a high power mode for planing over the sea, and a low power mode for land travel. It has a crew of three and can transport 17 marines and their equipment. The EFV would have been the first heavy tactical vehicle with a space frame structure.

The hull had a hydraulically actuated bow flap to aid planing with a maximum waterborne speed of 46 kilometres per hour (29 mph; 25 kn). Shrouded Honeywell waterjet propulsors are integrated into each side of the hull, which create over 2,800 horsepower (2,100 kW) of thrust. It was also outfitted with hydraulically actuated chines to cover the tracks while in seafaring mode.

The vehicle uses an Ethernet network connected by the Tactical Switch Router, based on the COTS DuraMAR Mobile IP router for its internal and external communications.

Armament
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The electrically powered two-man MK46 turret on the personnel variant accommodated the commander on the right and gunner on the left, a fire control system, and the main and coaxial weapons.

The standard version was to have had a Mk44 Bushmaster II 30 mm cannon, which fired up to 250 rounds per minute with single, burst, and fully automatic capabilities up to 2,000 metres (2,200 yd) in all weather conditions. A general purpose M240 7.62 mm machine gun with 600 rounds of ready-to-use ammunition was to be mounted coaxially with the main gun.

Controls

Water mode

• Throttle for movement
• Yaw for steering
• Throttle>0.75 for high speed mode

land mode

• Disable AG8 for land mode
• Pitch for throttle
• Roll for steering
• Trim for rotating turret
• VTOL for gun elevation

Notes

• When going on land, cut throttle and disable AG8 just before you hit the ground.