15mm M81A3 Stuart IFV

The standard Infantry Fighting Vehicle of the UCSA Army, the M81A3 Stuart can carry up to six fully-equipped infantrymen. In armored cavalry units, it supports a four-man fireteam, with the remaining space utilized for supplies and additional ammunition required for long-range reconnaissance mission. The six-man configuration, due to its cramped nature, is primarily used by conventional mechanized infantry units.

The M81A3's main armament is a 30mm autocannon firing caseless rounds. High-explosive dual-purpose rounds are typically utilized, though discarding-sabot projectiles are also available. The autocannon is supplemented by a coaxial .338 heavy machine gun and kinetic-kill active protection system. All weapons are entirely contained in an unmanned turret, and controlled from the commander/gunner's station inside the vehicle's hull.