MC/FI means Mass Casualty/fatality Incident in Military
Similar to MC/FI
60SSC - 60th Signal Service Company615 AMOG - 615th Air Mobility Operations Group
63B - Light Wheeled Vehicle Mechanic
63Y - Track Vehicle Mechanic Mos
643ASG - 643rd Area Support Group
645TD - 645th Tank Destroyer Battalion
66 TAC - 66th Tatical Aviation Command
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