BIST X3 is a virtual, indoor, infantry skills training system that enables the simulation of complex scenarios for units with up to 15 trainees in parallel. The training modes include marksmanship training, tactical shooting exercises, and unit maneuver training. The BIST X3 can use full simulated weapons (tethered) including heavy machine guns, mortars, and grenade launchers or Drop-in kits (tetherless inserts) for small arms.