| Code Value |
Definition |
| AF | AIR FORCE SERIAL NUMBER |
| AN | NON-IMMIGRATION ADMISSION NUMBER |
| AR | ALIEN REGISTRATION NUMBER |
| AS | NATIONAL GUARD SERIAL NUMBER |
| CG | US COAST GUARD SERIAL NUMBER |
| CI | CANADIAN SOCIAL INSURANCE NUMBER |
| FN | FINGERPRINT IDENTIFICATION NUMBER |
| MC | MARINE CORPS SERIAL NUMBER |
| MD | MARINERS DOCUMENT OR IDENTIFICATION NUMBER |
| MP | ROYAL CANADIAN MOUNTED POLICE ID OR FINGERPRINT SEC (FPS) NUMBER |
| NA | NATIONAL AGENCY CASE NUMBER-MILITARY |
| NS | NAVY SERIAL NUMBER |
| OA | ORIGINATING AGENCY POLICE OR STATE IDENTIFICATION NUMBER |
| PI | PERSON IDENTIFICATION NUMBER |
| PP | PASSPORT NUMBER |
| PS | PORT SECURITY CARD NUMBER |
| SS | SELECTIVE SERVICE NUMBER |
| VA | VETERANS ADMINISTRATION CLAIM NUMBER |