Douglas served with 2/1 Battalion in the Middle East prior to joining the unit in New Guinea as a Trooper in No 1 Sect, “A” Troop and returned to Australia with them aboard “TAROONA” on 3 Sept 1944. .
After leave and reorganization, he embarked for New Britain aboard “TAROONA” on 9 Apr 1945 with the unit as a Trooper in No 1 Sect, “A” Troop. He was promoted to Lance Corporal on New Britain. Whilst on New Britain he attended Course No 5, Flame Thrower School from 5 Jul to 9 Jul 1945.
He was discharged on 16 Apr 1946.