PH/PK means Probability of Hit/Probability of Kill in Military
Similar to PH/PK
615 AMOG - 615th Air Mobility Operations Group63B - 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
67Y - AH-1 Attack Helicopter Repairer MOS
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