- Army Serial Number (ASN)
- The unique service number used to distinguish one soldier from others with similar names.
- Discharge or separation paper
- The document issued when a service member left active service. For many WWII Army enlisted soldiers, this is WD AGO Form 53-55. It summarizes service but is not a day-by-day history.
- Morning Report
- An Army unit’s daily administrative report. It usually lists people whose status changed, not every person in the unit.
- Unit record
- A document created by a military organization. It may name the soldier directly or provide context about his unit; the timeline states which applies.
- OMPF or “201 file”
- The service member’s Official Military Personnel File. Many Army and Air Force files were damaged or destroyed in the 1973 National Personnel Records Center fire.
- 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.
- MOS
- Military Occupational Specialty—the Army’s classification for a soldier’s primary military job.
- 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.