The gunner is quite visible in the turret of the vehicle, and so he can also be a communicator to any people outside the vehicle. Corpsman - The platoon's Corpsman is a U.S. Navy Hospital Corpsman with additional field medical training. The corpsman takes a full part in operations with the rest of the team, but also provides medical assistance and coverage when necessary. Dismount - The dismount is responsible for anything that needs to be done outside of the vehicle such as obtaining visual information that is not possible from the vehicle's point of view. This billet may be combined with any of the other billets, except usually not for the VC or the driver. Ammo man - The Ammo man is another combined billet. When the gunner is using the gun, someone may be responsible for taking old ammo and providing the gunner with live ammo (missiles or rounds). This improves the rate of fire of the weapons system. See also Mobile Assault Platoon References External links 3/3's CAAT platoon, deployed to Afghanistan as of late 2007 CAAT Photo by Gunnery Sgt. Keith A. Milks. Infantry units and formations Military terminology Infantry United States Marine Corps organization