- Service number
- The unique number the Navy gave each enlisted sailor, used to distinguish him from others with similar names.
- Discharge or separation paper
- The document issued when a service member left active service. For WWII sailors this is usually the Notice of Separation, NAVPERS 553. It summarizes service but is not a day-by-day history.
- Muster roll and Report of Changes
- A ship’s quarterly list of its enlisted crew, and the monthly report of arrivals, transfers and promotions.
- Unit record
- A document created by a military organization. It may name the service member directly or provide context about his unit; the timeline states which applies.
- OMPF
- The service member’s Official Military Personnel File, held at the National Personnel Records Center in St. Louis. Navy files were not damaged in the 1973 fire there.
- Unit and final unit
- A unit is the organization in which someone served. The final unit is the organization shown at separation; it may not be the only unit in the service history.
- Rank or grade
- The service member’s level in the military hierarchy. A timeline may show changes in rank over time.
- Rating and rate
- A rating is a sailor’s trade, such as Electrician’s Mate. His rate adds the pay grade: EM1c is Electrician’s Mate First Class, and CEM is Chief Electrician’s Mate.
- Assigned and attached
- Assigned means formally placed in a unit. Attached usually means serving with a unit temporarily while belonging administratively elsewhere.
- Special Orders and General Orders
- Official directives used to authorize personnel actions, awards, organizational changes, and other decisions.
- Campaign credit
- Official recognition for service connected with a named campaign. It does not, by itself, describe a service member’s individual actions.
- Station or location
- The place from which a unit filed a report. It does not automatically prove that every member was physically present there.
- Source citation
- The note beneath a timeline entry identifying the record or records that support it.