The Ontos ("Thing" in Greek), officially the Rifle, Multiple 106 mm, Self-propelled, M50, was an American light armored tracked anti-tank vehicle developed in the 1950s. It mounted six M40 106 mm recoilless rifles as its main armament, which could be fired in rapid succession against single targets to guarantee a kill. It was produced in limited numbers for the U.S. Marines after the U.S. Army lost interest in the project. The Marines consistently reported excellent results when they used the Ontos for direct fire support against infantry in numerous battles and operations during the Vietnam War. The American stock of Ontos was largely expended towards the end of the conflict and the Ontos was removed from service in 1969.
The M50 Ontos is a light armored tank featured in Battlefield Vietnam, exclusively on Operation Cedar Falls. It is capable of launching rockets from the launchers on either side. Like most tracked vehicles, it moves slowly and isn't very maneuverable. When compared to BRDM, it isn't amphibious and is slower, however, it have higher armor and far more destructive weaponry. Unlike other armored vehicles, however, it won't last long against rockets and grenades.
The player manning the Ontos has the choice to either fire one rocket at a time individually, or fire them all at once.