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| id | abbr | meaning |
|---|---|---|
| 5301 | IREMBASS | Improved Remotely Monitored Battlefield Surveillance System |
| 5302 | IRDS | Infrared Detection System |
| 5303 | IREMBASS | Improved-Remotely Monitored Battlefield Sensor System |
| 5304 | IREPS | Integrated Refractive Effects Prediction System |
| 5305 | IRF | Imagery Readiness Facility |
| 5306 | IRF | Intelligence Readiness Facility |
| 5307 | IRG | Interdepartmental Regional Group |
| 5308 | IRGM | Infrared Guidance Module |
| 5309 | IRINT | Infrared Intelligence |
| 5310 | IRIS | Infrared Imaging System |
| 5311 | IRISA | Imagery Report Index Summary |
| 5312 | IRISF | Intelligence Report Index Summary File |
| 5313 | IRK | Interswitch Rekeying Key |
| 5314 | IRLS | Infrared Line Scanner |
| 5315 | IRM | Intelligence Requirements Management |
| 5316 | IRM | Information Resource Management |
| 5317 | IRMS | Imagery Requirements Management System |
| 5318 | IROF | Imagery Reconnaissance Objectives File |
| 5319 | IROL | Imagery Reconnaissance Objectives List |
| 5320 | IROP | Imagery Reconnaissance Objectives Plan |
| 5321 | IROP | Infrared Optical Intelligence |
| 5322 | IROP | Imagery Requirements Objectives Program |
| 5323 | IRPG | Installation Reference Points Graphics |
| 5324 | IRPIA | Intelligence Information Report Photo Index |
| 5325 | IRR | Individual Ready Reserve |
| 5326 | IRR | Intelligence Requirement Request |
| 5327 | IRR | Intelligence Readiness Report |
| 5328 | IRS | Intelligence Research Specialist |
| 5329 | IRS | Internal Revenue Service |
| 5330 | IRS | Interface Requirements Specification |
| 5331 | IRS | Intelligence Requirements Subcommittee |
| 5332 | IRSCOM | Imagery Requirements Subcommittee |
| 5333 | IS | Information Systems |
| 5334 | IS | Intelligence Specialists |
| 5335 | IS | Intelligence Squadron |
| 5336 | I&S | Intelligence and Security |
| 5337 | I&S | Intelligence and Surveillance |
| 5338 | ISA | International Security Affairs |
| 5339 | ISA | Interservice Support Agreement |
| 5340 | ISA | Intelligence Support Activity |
| 5341 | ISA | Integration |
| 5342 | Support | Activity |
| 5343 | Support | International Support Agreement |
| 5344 | ISAF | Israeli Air Force |
| 5345 | ISAR | Inverse Synthetic Aperture Radar |
| 5346 | ISARC | Intelligence, Surveillance, and Reconnaissance Cell |
| 5347 | ISB | Initial Staging Base |
| 5348 | ISB | Intermediate Staging Base |
| 5349 | ISB | Intelligence Systems Board |
| 5350 | ISB | Intelligence Support Base |
| 5351 | ISC | Information Systems Command |
| 5352 | ISC | Information Science Center |
| 5353 | ISC | Intelligence Support Cell |
| 5354 | ISCO | Intelligence Support to Combined Operations |
| 5355 | ISC/SC | Intelligence Specialist Chief/Senior Chief |
| 5356 | ISD | Intelligence Support Detachment |
| 5357 | ISD | Intelligence Security Division |
| 5358 | ISD | Intelligence Support Division |
| 5359 | ISDB | Integrated Satellite Data Base |
| 5360 | ISDN | Integrated Services Data Network |
| 5361 | ISDN | Intelligence Services |
| 5362 | Digital | Network ISEIntelligence Support Element |
| 5363 | ISEMS | Improved Spectrum Efficiency Modeling and Simulation |
| 5364 | ISEW | Intelligence, Security, and Electronic Warfare |
| 5365 | ISF | Intelligence Support Facility (U.S. Navy) |
| 5366 | ISG | Intelligence Support Group (U.S. Navy) |
| 5367 | ISHMRS | Improved SOF High Frequency Manpack Radio System |
| 5368 | ISIC | Intelligence Support and Indications Center |
| 5369 | ISID | Interim Secondary Imagery Dissemination System |
| 5370 | ISIDS | Improved SIDS |
| 5371 | ISINT | Instrumentation Signals Intelligence |
| 5372 | ISIP | Intelligence Support Interface Program |
| 5373 | ISIS | Integrated Signals Intelligence System |
| 5374 | ISIS | Interim SOCOM Intelligence Threat Data System |
| 5375 | ISLES | Information Systems for Law Enforcement Support |
| 5376 | ISM | Industrial Security Manual |
| 5377 | ISMB | Intelligence Systems Management Board |
| 5378 | ISO | Information Systems Office |
| 5379 | ISO | International Standards Organization |
| 5380 | ISOFAC | Isolation Facility |
| 5381 | ISOPREP | Isolated Personnel Report |
| 5382 | ISOS | Intelligence System of Systems |
| 5383 | ISP | Intelligence Support Plan |
| 5384 | ISP | Industrial Security Program |
| 5385 | ISP | Intelligence Support Processor |
| 5386 | ISP | Integrated Survey Program |
| 5387 | ISP | Intelligence Survey Program |
| 5388 | ISP | DCS Integrated Survey Program Data Collection System |
| 5389 | ISP | CPE Integrated Survey Program Central Production Element |
| 5390 | ISPER | IPAC Special Reports |
| 5391 | ISPO | Intelligence Support Program Office |
| 5392 | ISPR | Information Systems Processing Request |
| 5393 | ISPS | ISP Server |
| 5394 | ISPS | Improved SOF Power Sources |
| 5395 | ISPT | Intelligence Support Processor Tool |
| 5396 | ISR | Imagery Support Requirement |
| 5397 | ISR | Inter-Agency Source Registry |
| 5398 | ISR | Intelligence, Surveillance and Reconnaissance |
| 5399 | ISRD | Information Systems Requirement Document |
| 5400 | ISS | Intelligence Support System |
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