The other 3 men on this short list were all intelligence appointments. Bennett, White and Jeune
1917 Nov Joined the 2nd Battalion Royal Highlanders in Mesopotamia.
1918 Jun 15. R. Sco. Fus. to be temp 2nd Lt. -Sjt. David Brown, from T.F.
1918 Sep 18. Service Battalion, Royal Scotts. However his Special Appointment is only from 18 Sep 1918 to 2 May 1919
1921 May 19. His address is 28 Pandora Road. London NW6 (the 1910 census has that address as a boarding house with rooms)
Intelligence Dublin Castle