Mounting up to 6 recoilless rifles the Ontos possessed a fearsome amount of firepower. However, being basically unarmoured and needing the crew to be exposed to reload, which could only be occomplished from outside the vehicle meant that it was extremely vulnerable. Its 6 recoilless rifles, if fired collectively, produced a considerable backblast which would reveal the vehicle to all onlookers and usually invoke a considerable response. The Ontos didn't really come into its own, except during the great battles in Hue' during the 1968 Tet Offensive when indirect fire support was denied to the attacking Marines for fear of damaging the city. 1 x M60 GPMG over rear roof hatch.
Passengers are also able to fire their weapons through ports in hull side or from roof hatches.
The Commando was a radical departure from normal US Army practices of the period which emphasised mobility over the nuclear battlefield. Unlikely to be very heavy though due to its low weight. Unlikely to be very heavy though due to its low weight. Successor to the M108 was the M109 which used the same hull but had a heavier 155mm gun mounted in the turret and carried one more Ammunition Number in the crew. Unlikely to be much because of low vehicle weight.