Mac
Fellow soldier / roommate
Mentioned: 1915, 1916 (unconfirmed if same person both years)
McGill & friends from home A close friend and early bunkmate, with Robertson from the Atlantic crossing onward in 1915. Possibly, but not confirmed, the same person as the 'R.V. Mac' who recurs in 1916 pursuing a commission. A separate 'Mackenzie/Mack' also appears late in 1916, so it's worth not conflating the three.