OPUS means OSS/PODPS Observation Support System/Post-Observation Data Processing System Unified System in Military

Similar to OPUS

3ACC - 3A Central Control
3DS - Digital Decision Display System
3JR - Third Battalion Jamaica Regiment
3M - Maintenance and Materiel Management
3XMAG - 3X Magnifier lens
4-W - 4-Wire
407 RRD - 407th Radio Research Detachment

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