After the mobilization in 1939 almost 900,000 men served, and just before Operation Barbarossa in 1941 the personnel strength had reached 1.5 million men.[1] The Luftwaffe reached its largest personnel strength during the period November 1943 to June 1944, with almost three million men and women in uniform; 1.7 million of these were male soldiers, 1 million male Wehrmachtsbeamte and civilian employees, and almost 300,000 female and male auxiliaries (Luftwaffenhelfer).[64] In October 1944, the anti-aircraft units had 600,000 soldiers and 530,000 auxiliaries, including 60,000 male members of the Reichsarbeitsdienst, 50,000 Luftwaffenhelfer (males age 15–17), 80,000 Flakwehrmänner (males above military age) and Flak-V-soldaten (males unfit for military service), and 160,000 female Flakwaffenhelferinnen and RAD-Maiden, as well as 160,000 foreign personnel (Hiwis).[65][66]