Allen was born in Charters Towers, Queensland, in 1919. Prior to his military service, he worked as a jackeroo in Queensland.
He joined the Militia in 1939 serving with 26 Battalion and enlisted with the Royal Australian Air Force in December of 1940. Allen attained the rank of Flying Officer (FO) in March 1942 while attached to 41 Squadron, Royal Air Force.
FO Allen was killed in an aircraft accident in Breighton, Yorkshire, England on 20 June 1942.
