Mulock joined 13 Battery, Canadian Field Artillery in 1911. He enrolled in the Canadian Expeditionary Force in September 1914 and served as a corporal with the 1st Battery, 1st Brigade, and 12th Battery, 3rd Brigade, Canadian Field Artillery in Canada and England until December 1915.[2] After transferring to the Royal Naval Air Service and undergoing pilot training, he was posted to 1 Naval Wing. Although he first saw combat in July 1915, he did not score his first win until 30 December. He then scored on 24 and 26 January 1916, and twice on 21 May 1916. Four of the victories were of the "out of control" variety; the other was "forced to land".
^Above the Trenches: A Complete Record of the Fighter Aces and Units of the British Empire Air Forces 1915–1920. p. 287.
^London Gazette 11 August 1917, 16 March 1918, 16 June 1918
^Above the Trenches: A Complete Record of the Fighter Aces and Units of the British Empire Air Forces 1915–1920. p. 287.
^"Member Profiles". Canada's Aviation Hall of Fame. Archived from the original on 10 November 2016. Retrieved 14 January 2018.
Additional sources
Above the Trenches: a Complete Record of the Fighter Aces and Units of the British Empire Air Forces 1915–1920. Christopher F. Shores, Norman L. R. Franks, Russell Guest. Grub Street, 1990. ISBN0-948817-19-4, ISBN978-0-948817-19-9.
Shorty – An Aviation Pioneer: The Story of Victor John Hatton. James Glassco Henderson. Trafford Publishing 2004. ISBN1-4120-3897-9.
Courage in the Air. Arthur Bishop. McGraw-Hill Ryerson Ltd. 1992. ISBN0-07-551376-5.