Each "Gruppe" was commanded by a "Kommandeur", and a "Staffel" by a "Staffelkapitän". However, these were "appointments", not ranks, within the "Luftwaffe". Usually, the "Kommodore" would hold the rank of "Oberstleutnant" (lieutenant colonel) or, exceptionally, an "Oberst" (colonel). Even a "Leutnant" (second lieutenant) could find himself commanding a "Staffel". Similarly, a bomber wing was a "Kampfgeschwader" (KG), a night fighter wing was a "Nachtjagdgeschwader" (NJG), a dive bomber wing was a "Stukageschwader" (StG), and units equivalent to those in RAF Coastal Command, with specific responsibilities for coastal patrols and search and rescue duties, were "Küstenfliegergruppen" (Kü.Fl. Gr.). Specialist bomber groups were known as "Kampfgruppen" (KGr). The strength of a bomber "Geschwader" was about 80–90 aircraft. The peacetime strength of the "Luftwaffe" in the spring of 1939 was 370,000 men. 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. 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"). 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).