Following initial officer training at the RAF College Cranwell and subsequent flying training, he was promoted to flying officer on 15 January 1967 and flight lieutenant on 15 January 1969.
Following initial officer training at the RAF College Cranwell and subsequent flying training, Squire flew Harriers with No.3 Squadron from 1975 to 1978. He was promoted to flying officer on 15 January 1967 and flight lieutenant on 15 January 1969.