| Term | History |
|---|
| 1 | Became a Engineer/Gunner at age 18 |
| 1 | Is now a Crewman |
| 1 | Good fortune |
| 1 | Attempt at commissioned failed. |
| 1 | Promoted to Engineer/Gunner rank 1 |
| 1 | Is now a Able Spacehand |
| 2 | Continued as Engineer/Gunner at age 22 |
| 2 | Advanced training in a specialist field |
| 2 | Forced to continue current assignment |
| 2 | Promoted to Engineer/Gunner rank 2 |
| 2 | Is now a Petty Officer, 3rd class |
| 3 | Continued as Engineer/Gunner at age 26 |
| 3 | A new romantic starts. Gain an Ally. |
| 3 | Promoted to Engineer/Gunner rank 3 |
| 3 | Is now a Petty Officer, 2nd class |
| 4 | Voluntarily left Engineer/Gunner |
| 4 | Switched to Line/Crew at age 30 |
| 4 | Special assignment or duty on board ship. |
| 4 | Promoted to Line/Crew rank 4 |
| 4 | Is now a Petty Officer, 1st class |
| 5 | Continued as Line/Crew at age 34 |
| 5 | A romantic relationship deepens, possibly leading to marriage. Gain an Ally. |
| 5 | Promoted to Line/Crew rank 5 |
| 5 | Is now a Chief Petty Officer |
| 6 | Continued as Line/Crew at age 38 |
| 6 | Vessel participates in a notable military engagement. |
| 6 | Promoted to Line/Crew rank 6 |
| 6 | Is now a Master Chief |
| 7 | Continued as Line/Crew at age 42 |
| 7 | Advanced training in a specialist field |
| 7 | Promoted to Line/Crew rank 7 |