Halverson served in the
Royal Australian Air Force (RAAF) from 1956 to 1981, attaining the rank of
group captain. He enlisted as an
airman, but was selected to join the
Officer Cadet School where he topped his year. His first posting was to
RAAF Base Townsville, where an explosion left him deaf in one ear and ended his ambitions to become a pilot. He was subsequently transferred back to Melbourne where he worked in supply and equipment. In 1966, Halverson moved to Washington, D.C., in connection with the RAAF's purchase of
F-111 fighter jets. He returned to Australia but moved overseas again in 1976, when he was seconded to the British
Royal Air Force's
RAF Support Command for three years. He was made an
Officer of the Order of the British Empire in 1978. Halverson retired from the RAAF in 1981. ==Politics==