| Abbreviation | Definition |
|---|---|
| LER | Loss Exchange Ratio |
| LERSM | Lower Echelon Reporting and Surveillance Module |
| LERTCON | aLERT CONdition |
| LES | Law Enforcement Sensitive |
| LES | Lincoln Laboratories Experimental Satellite |
| LESO | Law Enforcement Support Office |
| LET | Light Equipment Transport |
| LET | Light Equipment Transporter |
| LEWDD | Light Early Warning Detection Device |
| LEWDD | Light Early-Warning Detection Device |
| LEX | Lexington |
| LF | Landing Force |
| LF | Launch Facility |
| LF | Lebanese Forces |
| LF | Left Face |
| LF | Legendary Force |
| LF | Lift Fan |
| LF | Light Fighter |
| LF | Line Feed |
| LF | Logistics Flight |