Air Cdr. William Harold Primrose, C.B.E., D.F.C. was Officer Commanding No.113 Squadron, R.F.C. in 1917 and No.57 Reserve Squadron in Sep 1917, 38th (Reserve) Wing in Egypt from 5 Nov 1917 and 32nd (Reserve) Wing in Egypt from 30 Dec 1917.
Ewen George Macpherson Gilchrist was educated at the University of Edinburgh and appointed a Lieutenant with the Royal Army Medical Corps in July 1915, promoted to Captain in July 1916 and joined the 1/3rd East Anglian Field Ambulance in Egypt.