 Flight officer was established as a rank equivalent to flight lieutenant in the women's air services of several Commonwealth nations.The rank was used by the British Women's Auxiliary Air Force (WAAF) and its successor, the Women's Royal Air Force (WRAF), until 1968, and by Princess Mary's Royal Air Force Nursing Service (PMRAFNS) until 1980.It was also previously used in the Women's Royal Australian Air Force, which was absorbed into the Royal Australian Air Force in 1977.