 In 1949, a total of 310 of the more modern FB.50s, designated "J 28B", which were based on the Vampire FB.5, were procured.The last of these was delivered in 1952, after which all piston-engined fighters were decommissioned.In addition, a total of 57 two-seater DH 115 Vampires, designated "J 28C", were also used for training purposes.