| Term |
Age |
History |
|---|
| 1 |
18 |
Failed to qualify for Marine Support (Marine). |
| 1 |
18 |
Submitted to the draft. |
| 1 |
18 |
Became a Army (Army Support) with the new title Private. |
| 1 |
19 |
Gained a contact. |
| 1 |
22 |
Promoted to Army (Army Support) rank 1 with the new title Lance Corporal. |
| 2 |
22 |
Continued as Army (Army Support). |
| 2 |
25 |
Advanced training in a specialist field |
| 2 |
26 |
Promoted to Army (Army Support) rank 2 with the new title Corporal. |
| 3 |
26 |
Attempted to change assignments. |
| 3 |
26 |
Switched to Army (Infantry) with previous rank. |
| 3 |
29 |
Thrown into a brutal ground war |
| 3 |
30 |
Promoted to Army (Infantry) rank 3 with the new title Lance Sergeant. |
| 4 |
30 |
Continued as Army (Infantry). |
| 4 |
34 |
Commanding officer takes an interest in John Doolan's career. |
| 4 |
34 |
Promoted to Army (Infantry) rank 4 with the new title Sergeant. |
| 5 |
34 |
Continued as Army (Infantry). |
| 5 |
37 |
Commanding officer takes an interest in John Doolan's career. |
| 5 |
38 |
Promoted to Army (Infantry) rank 5 with the new title Gunnery Sergeant. |
| 6 |
38 |
Continued as Army (Infantry). |
| 6 |
42 |
Assigned to a planet with a hostile or wild environment. |
| 6 |
42 |
Promoted to Army (Infantry) rank 6 with the new title Sergeant Major. |