 Their primary role as a target tug included towing targets for ground-to-air firing practice, photographic marking of ground-to-air firing, target towing for air-to-air practice by night and day, "throw-off" target practice and radar calibration.All existing Sturgeon TT.2s were planned to be modified to a TT.3 standard during the early 1950s, however the conversion programme was halted after five aircraft.The extended TT.2 nose with its synchronised photographic equipment and crew station was removed and replaced by a smaller streamlined nose cone.