| Term |
Age |
History |
|---|
| 1 |
18 |
Failed to qualify for Scientist (Scholar). |
| 1 |
18 |
Submitted to the draft. |
| 1 |
18 |
Became a Navy (Engineer/Gunner) with the new title Crewman. |
| 1 |
22 |
Vessel participates in a notable military engagement. |
| 1 |
22 |
Promoted to Navy (Engineer/Gunner) rank 1 with the new title Able Spacehand. |
| 2 |
22 |
Attempted to change assignments. |
| 2 |
22 |
Switched to Navy (Line/Crew) with previous rank. |
| 2 |
26 |
Birth or Death involving a family member or close friend. |
| 3 |
26 |
Continued as Navy (Line/Crew). |
| 3 |
30 |
Vessel participates in a diplomatic mission. |
| 3 |
30 |
Promoted to Navy (Line/Crew) rank 2 with the new title Petty Officer, 3rd class. |