Lew's M3 Half-track troop carrier was originally a Torro M16 quad gun carriage with a turret mounting quad 50 cal. BMGs. That was converted to a M3 troop carrier with a squad of soldiers the would "help load 105mm ammunition from the trailer into the M4A3 Mobile Howitzer as well as standby infantry protection. This would be part of a motor gun platoon.
Below is the components that were originally in the half-track and subsequently removed.
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