The 10th Special Forces Group are an Active Duty SFG . They have never been an Army National Guard unit. 

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63B Light-Wheel Vehicle Mechanic, xxx20 – specialist (Specialist 4th Class, E-4)

 63B10 would indicate that he made it to E-4 But was demoted to E-2 before Discharge 

This Ain’t Hell Blog ; http://thisainthell.us/blog/?p=45305