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| id | abbr | meaning |
|---|---|---|
| 4001 | FCT | Foreign Comparative Test |
| 4002 | FCZ | Forward Combat Zone |
| 4003 | FD | Functional Design |
| 4004 | F/d | Ratio of focal-length to diameter (of reflector type antennas) |
| 4005 | FDB | Fleet Database |
| 4006 | FDBM | Functional Data Base Manager |
| 4007 | FDBPS | Fleet Data Base Production System |
| 4008 | FDC | Fire Direction Center |
| 4009 | FDDAC | Foreign Denial and Deception Analysis Committee |
| 4010 | FDDI | Fiber Distributed Data Interface |
| 4011 | FDDS | Flag Data Display System |
| 4012 | FDIU | Fill Device Interface Unit |
| 4013 | FDM | Frequency Division Multiplexing |
| 4014 | FDMA | Frequency Division Multiple Access |
| 4015 | FDO | Foreign Disclosure Officer |
| 4016 | FDOA | Frequency Difference of Arrival |
| 4017 | FDR | Foreign Disclosure Representative |
| 4018 | FDT&E | Force Development Test & Experimentation |
| 4019 | FDU | Force Design Update |
| 4020 | FDW | Forward Deployed Workstation |
| 4021 | FDX | Full Duplex |
| 4022 | FEA | Front End Analysis |
| 4023 | FEAF | Far Eastern Air Forces |
| 4024 | FEBA | Forward Edge of the Battle Area |
| 4025 | Fed | Federal Reserve System |
| 4026 | FEDS | Front End Distribution System |
| 4027 | FEDSIM | Federal Computer Performance Evaluation and Simulation |
| 4028 | Center | |
| 4029 | FEL | Free Electron Laser |
| 4030 | FEMA | Federal Emergency Management Agency |
| 4031 | FEMD | Far East Military District |
| 4032 | FEMP | Front End Message Processors |
| 4033 | FEP | Front End Processor |
| 4034 | FEP | FLTSATCOM EHF Package |
| 4035 | FERS | Federal Employees Retirement System |
| 4036 | FET | Field Effect Transistor |
| 4037 | FETVD | Far East Theater of Military Operations |
| 4038 | FEWS | Future Early Warning System |
| 4039 | FEWSG | Fleet Electronic Warfare Support Group |
| 4040 | FF | Frigate |
| 4041 | FFA | Free-Fire Area |
| 4042 | FFAR | Folding-Fin Aerial Rocket |
| 4043 | FFED | FIREFINDER Elevation Data |
| 4044 | FFG | Guided-Missile Frigate |
| 4045 | FFGH | Guided-Missile Aviation Frigate |
| 4046 | FFGN | Nuclear-Powered Guided-Missile Frigate |
| 4047 | FFH | Aviation Frigate |
| 4048 | FFHGN | Nuclear-Powered Guided-Missile Aviation Frigate |
| 4049 | FFHN | Nuclear-Powered Aviation Frigate |
| 4050 | FFL | Corvette |
| 4051 | FFLG | Guided-Missile Corvette |
| 4052 | FFM | Full Face Mask |
| 4053 | FFN | Fleet Flash Net |
| 4054 | FFR | Radar Picket Frigate |
| 4055 | FFS | Fixed Field Site |
| 4056 | FFS | Formatted File System |
| 4057 | FFT | Training Frigate |
| 4058 | FGHQ | Fighter Group Headquarters (Canada) |
| 4059 | FGN | Foreign |
| 4060 | FH | Frequency Hopping |
| 4061 | FH/DS | Frequency Hopping/Direct Sequence |
| 4062 | FI | Finished Intelligence |
| 4063 | FI | Foreign Intelligence |
| 4064 | FI&SS | Foreign Intelligence and Security Service(s) |
| 4065 | FIA | Foreign Intelligence Agency |
| 4066 | FIC | Fleet Intelligence Center |
| 4067 | FIC | FORSCOM Intelligence Center |
| 4068 | FICEURLANT | Fleet Intelligence Center, Europe and Atlantic |
| 4069 | FICM | Fleet Intelligence Collection Manual |
| 4070 | FICPAC | Fleet Intelligence Center, Pacific |
| 4071 | FID | Foreign Internal Defense |
| 4072 | FID | Force Integration Division |
| 4073 | FIDB | Fundamental Intelligence Database |
| 4074 | FIE | Foreign Intelligence Element |
| 4075 | FIG | Figure |
| 4076 | FIIC | Force Imagery Interpretation Center |
| 4077 | FIIU | Force Imagery Interpretation Unit |
| 4078 | FIM | Force Integration Master Planner |
| 4079 | FIN | Fixed-Site Intelligence Network |
| 4080 | FIN | Financial |
| 4081 | FINPLAN | Financial Plan |
| 4082 | FIO | Foreign Intelligence Officer |
| 4083 | FIP | Force Improvement Plan |
| 4084 | FIP | Federal Information Processing |
| 4085 | FIPC | Foreign Intelligence Priorities Committee |
| 4086 | FIPS | Federal Information Processing Standard |
| 4087 | FIPS | Fleet Intelligence Production System |
| 4088 | FIR | Field Investigative Region |
| 4089 | FIRCAP | Foreign Intelligence Requirement Capabilities and Priorities |
| 4090 | FIRE | Fused Intelligence Report in Europe |
| 4091 | FIRF | Future Information Requirements Forecast |
| 4092 | FIRMS | Foreign Intelligence Relations Management System |
| 4093 | FIROPS | Freedom of Air Operations |
| 4094 | FIRST | Fleet Intelligence Reserve Support Team |
| 4095 | FIRSTEURLANT | Fleet Intelligence Reserve Support Team, Atlantic |
| 4096 | FIRSTPAC | Fleet Intelligence Reserve Support Team, Pacific |
| 4097 | FIS | Foreign Instrumentation Signals |
| 4098 | FIS | Foreign Intelligence Service |
| 4099 | FISA | Foreign Intelligence Surveillance Act |
| 4100 | FISAP | FMFPac Intelligence Sub-Architecture Plan |
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