An Armored Troop Carrier (ATC), not to be confused with an [[Armored Personnel Carrier]] (APC), were boats used during the Vietnam War to transport troops, patrol river ways, and transport fuel for other river vessels.  Converted from LCM (6) [[landing craft]] they could transport 40 equipped men to a battle zone and could provide fire support with their 20mm cannons, 7.62mm machine guns, 12.7mm heavy machine guns, and 40mm grenade launchers.

Modified versions equipped with a helicopter landing were designated as ATC(H).  The helicopter pad allowed for the evacuation of injured troops.
armored troop carrier (boat)