My late father was a Master Pilot, Jim Perry served 1948 to 1968. He had signed on for 22 years but due to contraction of the RAF took redundancy. His last posting after RAFCAW Strubby was as Unit Test pilot at Cranwell. He was issued a Warrant Officer warrant dated 15 Dec 1965 which I still have. When I went Varsity flying at Cranwell in 1969/70 there were very experienced Master Signallers who looked after us cadets with advice,food & drink.