Basquez is a soldier who operates a mounted, heavy artillery machine gun. He fires in bursts of three projectiles at a time and then makes a short pause. He remains stationary and cannot aim at any angle other than straight ahead. The bullets travel fast, though, and these units are usually emplaced in strategic positions where they may pin the player long enough for other infantry units to come (usually from behind) and finish the job.
Adopting a prone position in front of one will keep the player out of their line of fire and allow them to shoot at will. However, as the machine gun is armored, it takes several shots to destroy.
In the arcade version their behavior is slightly different, as the device is instead just an armored emplacement behind from where Basquez shelters himself, and has a peephole where he inserts a bazooka and fires one projectile at a time.