High Quality Content by WIKIPEDIA articles! The Expeditionary Fighting Vehicle (EFV) (formerly known as the Advanced Amphibious Assault Vehicle) is an amphibious assault vehicle that was being developed for the U.S. Marine Corps. It is 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.