IFFN means Identification, Friend, Foe, or Neutral in Military
Similar to IFFN
66 TAC - 66th Tatical Aviation Command67Y - AH-1 Attack Helicopter Repairer MOS
7 WVI - 7th West Virginia Infantry Regiment
75 RGR - 75th Ranger Regiment
772EOD - 722nd Ordnance Company
7CAV - 7th Cavalry Regiment the Michigan Seventh
81 IR ILL - 81mm Mortar Infrared Illumination Round
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