Ground support and combat units from the Reichsarbeitsdienst (RAD) and the National Socialist Motor Corps (NSKK) were also put at the Luftwaffe's disposal during the war. In 1942 56 RAD companies served with the Luftwaffe in the West as airfield construction troops. In 1943 420 RAD companies were trained as anti-aircraft artillery (AAA) and posted to existing Luftwaffe AAA battalions in the homeland.