No. 230 Operational Conversion Unit (OCU) was first created on 15 March 1947[1] at RAF Lindholme, by re-designation of No. 1653 Heavy Conversion Unit RAF, to convert crews onto the Avro Lancaster, Avro Lincoln and de Havilland Mosquito bombers. This unit was disbanded on 15 August 1952[1] to become the Reserve Training Squadron RAF. Re-formed again at RAF Upwood, from the Lincoln Conversion Flight RAF, 230 OCU trained Lincoln bomber crews until disbanded on 1 February 1955,[1] reverting to Lincoln Conversion Flight.