| Acronym | Meaning |
 | DOD | U.S. Department Of Defense |
| PU | Guinea-Bissau (FIPS 10-4 Country Code) -Polyurethane -United States Miscellaneous Pacific Islands (ISO 3166 Digram; Obsolete 1986) |
| ARL | UK Admiralty Research Laboratory (1921?1977) - U.S. Army Research Laboratory - UIUC Aviation Research Laboratory |
| PT | Petatesla -Physical Training (in The Army) -Portugal (ISO 3166 Digram) |
| KIR | Kyrgyz Language (ISO 639-2 Code) |
| TTFN | Ta Ta For Now |
| GCS | Global Coordinate System |
| DIFAR | DIrectional Frequency Analysis And Recording |
| DOHC | Dual-OverHead-Cam Engine |
| AV | Attovolt |
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