| Term |
Age |
History |
|---|
| 1 |
18 |
Became a Marine (Marine Support) with the new title Marine. |
| 1 |
22 |
Assigned to the security staff of a space station. |
| 1 |
22 |
Attempt at commissioned failed. |
| 1 |
22 |
Promoted to Marine (Marine Support) rank 1 with the new title Lance Corporal. |
| 2 |
22 |
Continued as Marine (Marine Support). |
| 2 |
24 |
A mission goes disastrously wrong due to Chesley Keiler's commander’s error or incompetence, but Chesley Keiler survive. |
| 2 |
24 |
Cover for the commander and gain an Ally. |
| 2 |
26 |
Promoted to Marine (Marine Support) rank 2 with the new title Corporal. |
| 3 |
26 |
Continued as Marine (Marine Support). |
| 3 |
29 |
Assigned to a black ops mission. |
| 3 |
30 |
Promoted to Marine (Marine Support) rank 3 with the new title Lance Sergeant. |
| 4 |
30 |
Continued as Marine (Marine Support). |
| 4 |
34 |
Advanced training in a specialist field |
| 4 |
34 |
Promoted to Marine (Marine Support) rank 4 with the new title Sergeant. |
| 5 |
34 |
Continued as Marine (Marine Support). |
| 5 |
38 |
On the front lines of a planetary assault and occupation. |
| 5 |
38 |
Promoted to Marine (Marine Support) rank 5 with the new title Gunnery Sergeant. |
| 6 |
38 |
Continued as Marine (Marine Support). |
| 6 |
40 |
Commanding officer takes an interest in Chesley Keiler's career. |
| 6 |
42 |
Promoted to Marine (Marine Support) rank 6 with the new title Sergeant Major. |