Colt M1911
The Gun is the basic sidearm for most members of the Commandos. The Allied model is the American made Colt M1911, The German model is the Luger and the Japanese Model is the Type 94.
The Allied 1911 has infinite ammo while the Luger and Type 94 have limited bullets, the Pistol kills in 3 shots in all games. (Except Rookie mode C3HD, where it will only need 2.)