Bill
Co60 is right on, i dont know of any company that does their own security investigations,,,, additionally pay the extra for the credit report,,,,,,, and know it,, so if and when they call you will have the answer already in hand...........
Don't be alarmed this is normal and all apart of the process..........
count yourself lucky you're not going for a DOE "Q" or "L" clearance ,,, then you would be subject to a much more intense investigation and a lie detector test...............
my "Q" took 12months to get because of backlog