| Term |
Age |
History |
|---|
| 1 |
18 |
Became a Scout (Explorer). |
| 1 |
20 |
Injured. |
| 2 |
20 |
Became a Navy (Line/Crew) with the new title Crewman. |
| 2 |
23 |
Advanced training in a specialist field. |
| 3 |
24 |
Continued as Navy (Line/Crew). |
| 3 |
26 |
Birth or Death involving a family member or close friend. |
| 4 |
28 |
Continued as Navy (Line/Crew). |
| 4 |
30 |
Vessel participates in a notable military engagement. |
| 4 |
32 |
Promoted to Navy (Line/Crew) rank 1 with the new title Able Spacehand. |
| 5 |
32 |
Continued as Navy (Line/Crew). |
| 5 |
35 |
Special assignment or duty on board ship. |
| 6 |
36 |
Attempted to change assignments. |
| 6 |
36 |
Failed to qualify for Flight (Navy). |
| 6 |
36 |
Continued as Navy (Line/Crew). |
| 6 |
37 |
Vessel participates in a diplomatic mission. |
| 6 |
40 |
Forced to muster out. |