The M3 half track was designed to be an infantry carrier for motorized artillery and armored divisions.
The M3 had a rear access door. A .30 cal machine gun was mounted on a M25 pedestal mount. M3s had either a winch or an unditching roller. There were racks on the outside of the passenger compartment that held 24 anti-personnel mines.
The passengers were carried on two benches in the back that faced each other.