In 1919 Thomas was stationed in Germany; while there, he received the
Air Force Cross on 3 June 1919. From 1920 to 1923 he served in Iraq as a
flight lieutenant filling a flight commander's position. On 13 February 1920, he was posted to
No. 6 Squadron RAF, operating
Royal Aircraft Factory R.E.8s and
Bristol F.2 Fighters from
Mosul, Iraq; he was
Mentioned in Despatches on 19 April 1921. In mid 1921, he transferred to
No. 30 Squadron in Baghdad to fly an
Airco DH.9a; he was again Mentioned in Despatches, on 28 October 1921. He was awarded the
Distinguished Flying Cross on 10 October 1922. Thomas returned from foreign service to begin attending
RAF Staff College on 1 May 1923. On 5 May 1924, he was graduated to
staff duty. He was promoted to
squadron leader on 1 January 1926. On 1 September 1928, he began instructing
cadets at the
Royal Air Force College Cranwell. Once again posted overseas, Thomas began attending the
Command and Staff College,
Quetta on 24 December 1931. In December 1933, he was moved to the Air Staff, Headquarters RAF India. His promotion to
wing commander came on 1 January 1934. Thomas returned to the British Isles to assume command of No. 6 Armament Training Camp,
RAF Warmwell on 24 May 1937. The following year, on 6 May, he became Senior Air Staff Officer for
No. 5 Group RAF. ==Second World War and beyond==