| Abbreviation | Definition |
|---|---|
| SLAR | Side-Looking Airborne Radar |
| SLATCM | Ship Launched Air Targeted Cruise Missile |
| SLBD | Sea Lite Beam Director |
| SLBM | Submarine Launched Ballistic Missile |
| SLBM | Submarine-Launched Ballistic Missile |
| SLBMS | Submarine Launched Ballistic Missiles |
| SLC | Satellite Laser Communications |
| SLC | Single Line Concept |
| SLC | Software Life Cycle |
| SLCM | Sea Launched Cruise Missile |
| SLCM | Sea-Launched Cruise Missile |
| SLCP | Ship Lighterage Control Point |
| SLCP | Ship's Loading Characteristics Pamphlet |
| SLCR | Shower Laundry Clothing Repair |
| SLD | System Link Designator |
| SLDR | Squadron Leader |
| SLE | Spearhead Land Element |
| SLEKE | Sabot Launched Electromagnetic Kinetic Energy |
| SLEKE | Sabot-Launched Electromagnetic Kinetic Energy |
| SLEM | Self Loading Experimental Model (battle rifle of British origin) |