| Acronym | Meaning |
| ALTACS | Automated Decision Logic Tactical Air Combat Simulation |
| MACHO | MAssive Compact Halo Object |
| KY | Cayman Islands (ISO 3166 Digram) - Kentucky (postal Symbol) |
| PB | Lead (Latin Plumbum) |
| DIS | Defence Intelligence Staff - (U.S.) Defense Investigative Service - Distributed Interactive Simulation - Draft International Standard (ISO) |
| HCF | Highest Common Factor |
| DMPA | (U.S.) Defense Medical Programs Activity |
| HURD | Hird Of Unix-Replacing Daemons (cf. Hird) |
| MRS | Magnetic Resonance Spectroscopy |
| SBS | Special Boat Service - Special Broadcasting Service |