DFD-WHS means Defense Facilities Directorate for Washington Headquarters Services in Military
Similar to DFD-WHS
5M - Machinery, Manpower, Material, Measurement, and Method6-DOF - Six Degree Of Freedom
60SSC - 60th Signal Service Company
615 AMOG - 615th Air Mobility Operations Group
63B - Light Wheeled Vehicle Mechanic
63Y - Track Vehicle Mechanic Mos
643ASG - 643rd Area Support Group
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