1. During his military service, he served as a Regimental Medical Officer . 2. He was appointed Regimental Medical Officer of the Singapore fell on 15 February 1942. 3. The Battery and A Troop commanders and the regimental medical officer were all wounded but carried on. 4. During the First World War he served as a regimental medical officer on the Pirogov Moscow Institute of Medicine. 5. He had an extremely distinguished record during the First World War during which he served as the Regimental Medical Officer . 6. The Regimental Medical officers of the tree Battalions were moved forward to C Company position to treat the casualties. 7. Over the course of the next two years, he was posted to different units to temporarily replace their Regimental Medical Officers . 8. In the fall of 1943, Barr received his first permanent posting as Regimental Medical Officer with the Highland Light Infantry of Canada. 9. Over Manekshaw's protests that he treat the other patients, the regimental medical officer , Captain G . M . Diwan, attended to him. 10. He served as a regimental medical officer with 23 Para Field Ambulance from 1971 to 1973 and with 2nd Battalion, Parachute Regiment from 1973 to 1974.