The most common 'standard calibre' for WW 2 Luftwaffe pilots was .32ACP, but no real standard auto pistol for flight crew due to the large number of arms manufacturing factories that Hitler procured in the course of events. Even the Browning 9mm Hi-Power was manufactured in big numbers for the Wehrmacht, complete with Waffenamt markings. The Walther PP and PPK were fairly common in cockpits, as well as Czech CZ27, BelgianM1922 FN, Hungarian M37 and Italian Berettas.