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| id | abbr | meaning |
|---|---|---|
| 4401 | GCDCAL | Great Circle Distance Calculator |
| 4402 | GCE | Ground Combat Element |
| 4403 | GCI | Ground-Controlled Intercept |
| 4404 | GCN | Ground Communications Network |
| 4405 | GCNTTY | Ground Communications Network Teletype |
| 4406 | GCP | Ground-Controlled Processor |
| 4407 | GCP-E | Ground-Controlled Processor-ELINT |
| 4408 | GCS | Graphics Compatibility System |
| 4409 | GCS | Ground Control Station |
| 4410 | GCS | Global Connectivity Services |
| 4411 | GCS | Global Communications |
| 4412 | System | |
| 4413 | GCSS | Global Combat Support System |
| 4414 | GDA | Gimbaled Dish Antenna |
| 4415 | GDBI | Generic Data Base Interface |
| 4416 | GDBMS | Generic Data Base Management Server |
| 4417 | GDIC | General Defense Intelligence Community |
| 4418 | GDIP | General Defense Intelligence Program |
| 4419 | GDIPP | General Defense Intelligence Proposed Program |
| 4420 | GDL | Gas Dynamic Laser |
| 4421 | GDOP | Geometric Dilution of Precision |
| 4422 | GDP | General Defense Plan |
| 4423 | GDP | Gross Defense Product |
| 4424 | GDP | Ground Defense Position |
| 4425 | GDP | Gross Domestic Product |
| 4426 | GDPS | Ground Data Processing System |
| 4427 | GDRS | Ground Data Reduction System |
| 4428 | GDS | General Declassification Schedule |
| 4429 | GDS | FSU Guards |
| 4430 | GDS | Group Decision Support |
| 4431 | GDSS | Global Decision Support System |
| 4432 | GDT | Ground Data Terminal |
| 4433 | Gen | General |
| 4434 | GEM | Ground Effects Machine |
| 4435 | GEN | Generation |
| 4436 | GEN | General |
| 4437 | GENIC | German National Intelligence Cell (NATO) |
| 4438 | GENREP | General Reports |
| 4439 | GENSER | General Service (Communications) |
| 4440 | GEO | Geosynchronous Earth Orbit |
| 4441 | GEODIS | Geographic Display |
| 4442 | GEODSS | Ground-Based Electro-Optical Deep-Space Surveillance System |
| 4443 | GEOFILE | Geographic Locations Code File System |
| 4444 | GEOFILE | Geolocation File (JOPES) |
| 4445 | GEOREF | Global Reference System, a worldwide position reference system that may be applied to any map or chart graduated in latitude and longitude regardless of projection. |
| 4446 | GEOSAT | Geological Satellite |
| 4447 | GEP | Ground Entry Point |
| 4448 | GEPS | Generic Electronic Publishing System |
| 4449 | GES | Ground Entry Station |
| 4450 | GFAC | Ground Forward Air Controller |
| 4451 | GFCP | Generic Front-End Communications Package |
| 4452 | GFE | Government Furnished Equipment |
| 4453 | GFTD | Global Force Trends Data Base |
| 4454 | GFR | Gap Filler Radar |
| 4455 | GGI&S | Global Geospatial and Information Services |
| 4456 | GHz | Gigahertz |
| 4457 | GIGSTER | NSA Video Teleconferencing System |
| 4458 | GIIPS | Geographic Installation Intelligence Production Specifications |
| 4459 | GIITS | General Intelligence Imagery Training System |
| 4460 | GIN | Greenland-Iceland-Norway |
| 4461 | GIPD | General Intelligence Production Detachment |
| 4462 | GIPD | General Intelligence Production Division |
| 4463 | GIPMIS | General Intelligence Production Management Information |
| 4464 | System | |
| 4465 | GIPS | Geographic Installation Intelligence Production Specifications |
| 4466 | GIPSY | Graphics Information or Presentation System |
| 4467 | GIS | Geographical Information System |
| 4468 | GIST | Graphical Intelligence Support Terminal |
| 4469 | GITAC | General Intelligence Training Advisory Committee |
| 4470 | GITC | General Intelligence Training Center |
| 4471 | GITS | General Intelligence Training System |
| 4472 | GIUK | Greenland-Iceland-United Kingdom |
| 4473 | GKNT | State Committee for Science and Technology (FSU) |
| 4474 | GKS | Graphics Kernel System |
| 4475 | GL | Grenade Launcher |
| 4476 | GLCM | Ground-Launched Cruise Missile |
| 4477 | GLLD | U.S. Ground Laser Locator Designator (for COPPERHEAD) |
| 4478 | GLMX | Geological Multi-Source Exploitation (System) |
| 4479 | GLOBIXS | Global Information Exchange System |
| 4480 | GLOMR | Global Low-Orbiting Message Relay |
| 4481 | GLONASS | Global Navigation Satellite System |
| 4482 | GM | Guided Missile |
| 4483 | GMD | Global Missile Defense |
| 4484 | GMF | Ground Mobile Forces |
| 4485 | GMFP | Global Military Force Policy |
| 4486 | GMFSC | Ground Mobile Force Satellite Communications |
| 4487 | GMI | General Medical Intelligence |
| 4488 | GMI | General Military Intelligence |
| 4489 | GMIPP | General Military Intelligence Production Plan |
| 4490 | GMIT | Ground Military Intelligence Team (ROK) |
| 4491 | GMRD | Guards Motorized Rifle Division (FSU) |
| 4492 | GMS | Ground Mobile System |
| 4493 | GMS | Geostationary Meteorological Satellite |
| 4494 | GMS | Ground Mission Supervisor |
| 4495 | GMT | Greenwich Mean Time (Zulu) |
| 4496 | GMTI | Ground Moving Target Indicator GNAS Gateway |
| 4497 | Network | Access System |
| 4498 | GNC | Global Navigation Chart |
| 4499 | GND | Ground |
| 4500 | GNP | Gross National Product |
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