The following is a list of anti-aircraft defences of Australia during World War II. Prior to the war Australia possessed only very limited air defences. However, by late-1942 an extensive anti-aircraft defence organisation had been developed, with anti-aircraft batteries in place around all the major cities as well as the key towns in northern Australia. A total of two Heavy Anti-Aircraft (HAA) regiments, 32 static HAA batteries, 11 Light Anti-Aircraft (LAA) regiments, 16 independent LAA batteries, three anti-aircraft training regiments and one anti-aircraft training battery were formed. These units were equipped with a range of weapon systems including 3.7 inch anti-aircraft guns and 40 mm Bofors guns. In addition six US Army anti-aircraft battalions were stationed in Australia, operating