He also served as Director-General of Joint Force Development, Strategic Command from April 2018 to March 2021.

[4] Later he studied international relations at King's College London and completed a Master of Arts degree in 2010.

[5] Stringer was commissioned into the General Duties Branch of the Royal Air Force on 5 September 1982 as an acting pilot officer.

[3] He was promoted to flying officer on 15 January 1986 with seniority from 15 October 1984,[8] and to flight lieutenant on 15 April 1987.

[10] Between April and September 1999, he was posted to the Gulf as part of Operation Southern Watch to maintain the Iraqi no-fly zones,[11] for which he was appointed a Member of the Order of the British Empire "in recognition of [his] gallant and distinguished services".