In the early postwar years, Crampton transitioned from
piston-engined bombers to
jet fighters, piloting the
Gloster Meteor as part of
12 Group at
RAF Horsham St. Faith and later the
de Havilland Vampire. In July 1951 he was selected to lead a special duty
flight that would train on
USAF RB-45C reconnaissance aircraft. After extensive training at
Barksdale Air Force Base, his crew which included his navigator
Rex Sanders and two others began covert operations. Code-named
Operation Ju-jitsu, four
North American RB-45C Tornado aircraft were stripped of their USAF markings and repainted in RAF colours. Based at
RAF Sculthorpe, the aircraft were tasked with flying deep level reconnaissance missions over the
Soviet Union to gather
electronic and
photographic intelligence. The special duties flight conducted missions during the period 1952–54. It was not until 1994 (under the "fifty year rule" of the
Public Records Act 1958) that the existence of the spy missions became public knowledge. During the final mission, Crampton's aircraft came under anti-aircraft fire and was nearly intercepted by
MiG 15s. In the aftermath, the Jiu Jitsu flights were folded up. Initially, Squadron Leader
Micky Martin of
Dambusters fame was chosen to lead the operations but he failed a mandatory high altitude pressurisation test and Crampton was selected instead. He was awarded the
Air Force Cross on 10 June 1954. ==Later career==