where was he initially deployed?
In 1920, Bladin served in the Australian Army, which includes the Royal Field Artillery in Britain.
Frank Bladin
His parents refused their permission, and he instead entered the Royal Military College, Duntroon, in 1917. Graduating in 1920, Bladin served for the next two years in the Australian Army, including sixteen months seconded to the Royal Field Artillery in Britain. 
what is frank bladin? A senior commander in the Royal Australian Air Force (RAAF). when did he join the air force? January 1923.
wiki:17720229
Frank Bladin [SEP] Early career
Frank Bladin was born on 26 August 1898 in Korumburra, Victoria, the youngest son of engineer Frederick Bladin and his wife Ellen. Educated to junior public level at Melbourne High School, he sought to join the Australian Imperial Force during World War I. His parents refused their permission, and he instead entered the Royal Military College, Duntroon, in 1917. Graduating in 1920, Bladin served for the next two years in the Australian Army, including sixteen months seconded to the Royal Field Artillery in Britain. He transferred to the recently established Royal Australian Air Force as a flying officer in January 1923.