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| id | abbr | meaning |
|---|---|---|
| 4201 | FORDTIS | Foreign Disclosure Technical Information System |
| 4202 | FORECON | Force Reconnaissance |
| 4203 | FORGE | Force Generation |
| 4204 | FORMAT | Foreign Materiel |
| 4205 | FORMDEPS | FORSCOM Mobilization and Deployment Planning System |
| 4206 | FORMICA | Foreign Military Intelligence Collection Activity |
| 4207 | FORMMS | Foreign Materiel Management System |
| 4208 | FORSCOM | U.S. Forces Command |
| 4209 | FORSTAT | Force Status and Identity Report |
| 4210 | FORT | Force Trends Data Base |
| 4211 | FORTRAN | Formula Translator |
| 4212 | FOSCAS | Foreign Ship Construction and Shipyards |
| 4213 | FOSD | Family of Sabotage Devices |
| 4214 | FOSIC | Fleet Ocean Surveillance Information Center |
| 4215 | FOSIC-E | Fleet Ocean Surveillance Information Center, Europe |
| 4216 | FOSICLANT | Fleet Ocean Surveillance Intelligence Center, Atlantic |
| 4217 | FOSICPAC | Fleet Ocean Surveillance Information Center, Pacific |
| 4218 | FOSIF | Fleet Ocean Surveillance Information Facility |
| 4219 | FOSIF | Rota Fleet Ocean Surveillance Information Facility, Rota |
| 4220 | FOSIF/WESTPAC | Fleet Ocean Surveillance Information Facility, Western Pacific |
| 4221 | FOTARS | Follow-On Tactical Reconnaissance System |
| 4222 | FOT&E | Follow-On Test and Evaluation |
| 4223 | FOTELSYS | Foreign Telecommunications Systems |
| 4224 | FOTRS | Follow-On Tactical Reconnaissance System |
| 4225 | FOUO | For Official Use Only |
| 4226 | FOV | Field of View |
| 4227 | FP | Fire Position |
| 4228 | FP | Field Post |
| 4229 | FP | Force Package |
| 4230 | FPA | Federal Preparedness Agency |
| 4231 | FPA | Focal Plane Array |
| 4232 | FPA | Force Projection Army |
| 4233 | FPB | Fast Patrol Boat |
| 4234 | FPE | Force Planning Estimate |
| 4235 | FPF | Final Protection Fire |
| 4236 | FPI | Foreign Positive Intelligence |
| 4237 | FPI | Federal Process Improvement |
| 4238 | FPIR | Force Protection Information Report |
| 4239 | FPL | Fire Protective Line |
| 4240 | FPN | Field Post Number |
| 4241 | FPO | Fleet Post Office |
| 4242 | fps | Feet Per Second |
| 4243 | FPTOC | Force Projection Tactical Operations Center |
| 4244 | FPU | Floating Point Unit |
| 4245 | FQ&P | Flying Qualities and Performance |
| 4246 | FRAG | Fragmentary Order |
| 4247 | FRAGO | Fragmentary Order |
| 4248 | FRD | Federal Research Division (Library of Congress) |
| 4249 | FRD | Formerly Restricted Data |
| 4250 | FRD | Functional Requirements Document |
| 4251 | FREQ | Frequency |
| 4252 | FRG | Federal Republic of Germany |
| 4253 | FRIES | Fast Rope Insertion Extraction System |
| 4254 | FRIF | Finished Recurring Intelligence File |
| 4255 | FROG | Free Rocket Over Ground |
| 4256 | FROKA | First Republic of Korea Army |
| 4257 | FROSS | Foreign Reliance on Space Systems |
| 4258 | FRPG | Facility Reference Point Graphic |
| 4259 | FRR | Frequency Resource Records |
| 4260 | FRS | Fleet Readiness Squadron |
| 4261 | FRS | Federal Research Service |
| 4262 | FRS | Forward Recording Site |
| 4263 | FRY | Former Republic of Yugoslavia |
| 4264 | FRYM | Former Republic of Yugoslavia-Macedonia |
| 4265 | FS | File Server |
| 4266 | FS | Fire Support |
| 4267 | F3S | Field Station Support System |
| 4268 | FSAIS | FICEURLANT SCI Analyst Information System |
| 4269 | FSB | Fleet Satellite Broadcast (of FLTSATCOM) |
| 4270 | FSB | Forward Staging Base |
| 4271 | FSB | Fire Support Base |
| 4272 | FSBS | Fleet Submarine Broadcast System |
| 4273 | FSCC | Fire Support Coordination Center |
| 4274 | FSCL | Fire Support Coordination Line |
| 4275 | FSCOORD | Fire Support Coordinator |
| 4276 | FSD | Field Support Division |
| 4277 | FSD | Forward Support Detachment |
| 4278 | FSE | Fire Support Element |
| 4279 | FSHB | Fallout Safe Height of Burst |
| 4280 | FSI | Foreign Service Institute |
| 4281 | FSIC | Forward Sensor Interface and Control |
| 4282 | FSK | Field Station, Korea |
| 4283 | FSK | Frequency Shift Keying |
| 4284 | FSM | Federated States of Micronesia |
| 4285 | FSO | Foreign Service Officer |
| 4286 | FSO | Fire Support Officer |
| 4287 | FSOC | Fairchild Satellite Operations Center |
| 4288 | FSOF | Forward Special Operations Facility |
| 4289 | FSP | Fire Support Plan |
| 4290 | FSRS | Functional Security Requirements Specification |
| 4291 | FSS | Fast Sealift Ship |
| 4292 | FSS | FAISS SID System |
| 4293 | FSS | Fixed Satellite Services |
| 4294 | FSSG | Force Service Support Group (USMC) |
| 4295 | FSST | Forward Space Support in Theater |
| 4296 | FST | Future Strategic Targets |
| 4297 | FST | Future Soviet Tank |
| 4298 | FSTC | Foreign Science and Technology Center (archaic; now NGIC) |
| 4299 | FSTS | Federal Security Telephone Service |
| 4300 | FSU | Former Soviet Union |
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