During World War II, Fort Bliss focused on training anti-aircraft artillery battalions (AAA). In September 1940 the Coast Artillery's anti-aircraft training center was established, and in 1941 the 1st Tow Target Squadron arrived to fly target drones (the 6th, 19th, and 27th Tow Target Squadrons were at the nearby Biggs Field). On 3 August 1944, the Anti-Aircraft Artillery School was ordered from Camp Davis to Fort Bliss to make the training of anti-aircraft gunners easier, and they became the dominant force at Fort Bliss following the departure of the U.S. 1st Cavalry Division. On 15 September 1942, the War Dept. made space available for handling up to 1,350 POWs, while POW camps could be constructed. During the war, the base was used to hold approximately 91 German and Italian Americans and Japanese from Hawaii (then a territory), who were arrested as potential fifth columnists but, in most cases, denied due process.