NACSEM means National Communications Security/Emanations Security
COMSEC/EMSEC Information Memorandum in
Military
Similar to NACSEM
3JR - Third Battalion Jamaica Regiment
3M - Maintenance and Materiel Management
3XMAG - 3X Magnifier lens
4-W - 4-Wire
407 RRD - 407th Radio Research Detachment
442 RCT - 442nd Regimental Combat Team
48 FW - 48th Fighter Wing
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