| Term |
Age |
History |
|---|
| 1 |
18 |
Became a Navy (Engineer/Gunner) with the new title Crewman. |
| 1 |
21 |
Vessel participates in a notable military engagement. |
| 1 |
22 |
Promoted to Navy (Engineer/Gunner) rank 1 with the new title Able Spacehand. |
| 2 |
22 |
Continued as Navy (Engineer/Gunner). |
| 2 |
25 |
Special assignment or duty on board ship. |
| 3 |
26 |
Voluntarily left Engineer/Gunner |
| 3 |
26 |
Became a Marine (Star Marine) with the new title Marine. |
| 3 |
28 |
Birth or Death involving a family member or close friend. |
| 3 |
30 |
Promoted to Marine (Star Marine) rank 1 with the new title Lance Corporal. |