What US Army Regulation or Policy...?

I know that all military vehicals are no suppose to be parked at the commissary or the PX/BX becaus eof problems with personal use of the vehical and it is stricly for military use, if you have an off post....whatever it is called signed by the SGM for you to drive the military vehical off post then you will have to see what the BN says about such things, their is no motorpool when you are on TDY with a military vehical, otherwise in my last unit, all vehicals were suppose ot be left in the motorpool, after duty hours and never over night.