The April 1942 reorganisation that created the Allied Land Forces and Allied Naval Forces also created the Allied Air Forces under Brett. Unlike MacArthur, Brett created a completely integrated headquarters, with a Royal Australian Air Force (RAAF) officer, Air Vice Marshal William Bostock, as his chief of staff. Each United States Army Air Forces (USAAF) staff officer was paired with a RAAF officer, with the senior staff posts divided evenly between them. A majority of command positions were held by Australians. To make up shortages of USAAF aircrew, RAAF aircrew were assigned to USAAF air groups, serving in every role except aircraft commander.