The LCAC, short for Landing Craft Air-Cushioned, is the beastly hovercraft used by the United States Marine Corps.  This ship is designed to transport supplies, vehicles, and troops to the shore from a Wasp class assault ship or other dock-landing/amphibious cargo ships participating in an amphibious assault.  These huge hovercraft can travel at up to 40 knots (46 mph), and have 2 machine gun emplacements and additionaly weapon mounts that can support additional machine guns or 40 mm grenade launchers.  There really isn’t a huge demand for armaments on this ship, as it will hit the shores after the EFVs and long after initial bombardment from maritime strike fighters such as the Harrier jump-jet or the new F35 Lightning.