| AEXIS | Arson and Explosives Information System |
| ATF | Bureau of Alcohol, Tobacco, Firearms and Explosives |
| DOL | Department of Labor |
| DOT | Department of Transportation |
| EPQ | Employee Possessor Questionnaire |
| FBI | Federal Bureau of Investigation |
| FLS | Federal Licensing System |
| FY | Fiscal Year |
| GAO | Government Accountability Office |
| NCIC | National Crime Information Center |
| NEIT | Northeast Inspection Team |
| NELC | National Explosives Licensing Center |
| NICS | National Instant Background Check System |
| NLC | National Licensing Center |
| NTN | NICS Transaction Number |
| OIG | Office of the Inspector General |
| OLC | Office of Legal Counsel |
| OLP | Office of Legal Policy |
| ROD | Relief of Disabilities |
| SEA | Safe Explosives Act |
| TECS | Treasury Enforcement Communications System |
| TSA | Transportation Security Administration |
| TTB | Alcohol and Tobacco Tax and Trade Bureau |
