Shepherd Arms 9mm (Walther P38) is a semi-automatic handgun available to the player in The Operative: No One Lives Forever. It features a 10-round detachable magazine. It can be fitted with a silencer, making it useful for a stealthy approach. There are various types of ammunition available for the P38.
In game description
This 9 mm semi-automatic pistol was used extensively by Allied covert operatives during the war. it is easily concealable and very reliable. It has a 10 round magazine and can be fitted with silencer.
The P38 was the sidearm of the German Armed Forces during World War II. Due to it's low cost compared to the Luger 9mm Parabellum, it was more common amongst the lower ranks, whereas the Luger was limited to the officers.
Walther P38 on Wikipedia