It was apparently put in to help protect the parachuting pilot. Parachutes are barely period correct, and not for scout planes until the very end for the Germans. Being armed with a rifle is goofy; where would you put it in the cramped cockpit? Taking down another aircraft at range while twisting in a chute is also not realistic. Having a rifle with that ammo capacity is not realistic. Realism was set aside for game play, though The rifle gives a tremendous advantage to defenders.