Australian Military Units
SX1435 Lieutenant Colonel Geoffrey Day Thomas Cooper, MBE
| Date of birth | 1912-04-02 | Adelaide, SA |
| Date and unit at enlinstment (ORs) | 1934-06-30 | |
| Date and unit at enlistment (ORs) | 1934-06-30 | 27th Battalion. |
| Date commissioned | 1935-08-07 | |
| Date promoted | 1935-08-07 | Lieutenant. |
| Other units | 1939-10-13 | Seconded 2/10th Battalion. |
| Date and unit at enlistment (ORs) | 1939-11-08 | Enlisted 2nd AIF. |
| Date promoted | 1940-02-23 | Captain. |
| Other | 1940-06-18 | Arrived Scotland. |
| Other | 1940-12-31 | Arrived Middle East from United Kingdom. |
| Date promoted | 1941-07-05 | Major. |
| Other | 1941-09-13 - 1941-12-30 | Course Middle East Staff School. |
| Other units | 1942-01-14 | Commanding officer 2/27th Battalion. |
| Other units | 1942-01-14 - 1942-12-01 | 2/27th Battalion. |
| Date of honour or award | 1942-02-18 | Member of the Order of the British Empire. |
| Date returned to Australia | 1942-03-25 | Adelaide. |
| Other | 1942-07-30 | Course 3MD Combined Operations School 18. |
| Other | 1942-08-14 | Arrived Moresby. |
| Date wounded | 1942-12-01 | Gun shot wound to neck and left arm. |
| Date returned to Australia | 1942-12-06 | Brisbane. |
| Other | 1943-03-11 | Seconded instructor senior Staff School. |
| Other | 1943-07-13 | Special Duty 9. |
| Other | 1943-12-10 | Chief instructor Jnr Tactical School, Second Australian Army. |
| Other | 1944-08-21 | Reserve of Officers. |
Interviewed by the author Peter Brune regarding his service in PNG.

