HDD in Military could mean:
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Similar to HDD
75 RGR - 75th Ranger Regiment772EOD - 722nd Ordnance Company
7CAV - 7th Cavalry Regiment the Michigan Seventh
81 IR ILL - 81mm Mortar Infrared Illumination Round
82AD - 82nd Airborne Division
8A - Minority-owned or other Disadvantaged Business
8AF - 8th Air Force
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