| Term |
Age |
History |
|---|
| 1 |
12 |
Became a Dolphin Military (Underwater Commando) with the new title Private. |
| 1 |
16 |
Participate in a major sea battle |
| 1 |
16 |
Promoted to Dolphin Military (Underwater Commando) rank 1 with the new title Lance Corporal. |
| 2 |
16 |
Continued as Dolphin Military (Underwater Commando). |
| 2 |
20 |
Commanding officer takes an interest in Arthur Crogan's career. |
| 2 |
20 |
Promoted to Dolphin Military (Underwater Commando) rank 2 with the new title Corporal. |
| 3 |
20 |
Voluntarily left Underwater Commando |
| 3 |
20 |
Became a Agent (Corporate Agent). |
| 3 |
22 |
Hard times caused by a lack of interstellar trade costs Arthur Crogan's job. |
| 4 |
24 |
Died at age 24 |