[2] On 9 January 1915 Baker received a commission as a temporary second lieutenant,[3] in the 15th (Service) Battalion of the Rifle Brigade.

[7] On 6 February 1917, although still only a second lieutenant, he was appointed a flight commander, with the temporary rank of captain,[8] in the newly formed No.

He later served on the staff of the Directorate of Training, before being appointed Officer Commanding, Aden Flight, in February 1924.

[7] In December 1932 he was promoted to wing commander,[11] and appointed chief flying instructor at RAF Leuchars.

51 Group, part of RAF Flying Training Command,[14] receiving promotion to air commodore (temporary) in September.

[17] He was appointed Senior Air Staff Officer at Headquarters RAF Middle East in June 1945.

[4] From December 1945 Baker served as Deputy Air Commander-in-Chief RAF Mediterranean and Middle East.

[20] Baker was a keen cricketer, and as a right-handed batsman,[32] he played for Haileybury College nine times between 1912 and 1914,[33] and twice for Hertfordshire in the Minor Counties Championship in August 1914.