| Term |
Age |
History |
|---|
| 1 |
18 |
Became a Scholar (Field Researcher). |
| 1 |
21 |
An expedition or voyage goes wrong, leaving Son Butler stranded in the wilderness. |
| 2 |
21 |
Failed to qualify for University. |
| 2 |
21 |
Became a Drifter (Scavenger). |
| 2 |
25 |
Son Butler do not know what happened to Son Butler. There is a gap in Son Butler's memory. |
| 3 |
25 |
Became a Navy (Engineer/Gunner) with the new title Crewman. |
| 3 |
27 |
Advanced training in a specialist field. |
| 3 |
29 |
Commissioned in Navy (Engineer/Gunner) with the new title Ensign. |
| 3 |
29 |
Promoted to Navy (Engineer/Gunner) officer rank 2 with the new title Sublieutenant. |
| 4 |
29 |
Continued as Navy (Engineer/Gunner). |
| 4 |
33 |
Advanced training in a specialist field. |
| 5 |
33 |
Attempted to change assignments. |
| 5 |
33 |
Failed to qualify for Line/Crew (Navy). |
| 5 |
33 |
Continued as Navy (Engineer/Gunner). |
| 5 |
37 |
Vessel participates in a diplomatic mission. |
| 5 |
37 |
Promoted to Navy (Engineer/Gunner) officer rank 3 with the new title Lieutenant. |