Military rank List view Flt Lt Robert Christian Bostrøm Military rank Airforce Date A/PO (prob.) Acting Pilot Officer (on probation) RAF Royal Air Force 19.08.1943 Plt Off. Pilot Officer (on probation) RAF Royal Air Force 14.10.1943 Fg Off. Flying Officer RAF Royal Air Force 14.04.1944 Flt Lt Flight Lieutenant RAF Royal Air Force 00.00.1945