AN/UMK-3 means Tactical Environmental Support System / Shipboard Meteorological and Oceanographic Observing System in Military
Similar to AN/UMK-3
20SCVI - 20th South Carolina Volunteer Infantry Regiment21CLW - 21st Century Land Warrior
21CLWTLD - 21st Century Land Warrior Top Level Demonstration
24 MEU - 24th Marine Expeditionary Unit
24NAF - 24th Numbered Air Force
26PEMR - 26th Pennsylvania Emergency Militia Regiment
278 ACR - 278th Armored Cavalry Regiment
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