List of conversion units of the Royal Air Force

After the end of the Second World War, the role of the HCUs was taken over by the operational conversion units (OCUs).

Some OCUs have a shadow, or reserve, squadron designation, which is used if the unit has a war role.

Therefore, smaller squadrons also incorporate training facilities to allow them to process aircrew onto their aircraft type.

Some roles, such as ISTAR, require more rear crew for the aircraft, such as weapon systems officers (WSOs) and weapon systems operators (WSOps) – their training can be more generalised, and this is carried out by 54 Squadron at RAF Waddington.

OCUs are monitored by the RAF's Central Flying School to maintain training standards.