is it allowed in the US military to carry a sidearm, if you bought it yourself and it is your own? or is it against military regularities. i ask that, because i saw a documentary about a group of Green Berets in Afghanistan and they all we're carrying different sidearms ( but maybe because they are Special Forces )

In germany it is not allowed to bring your own weapon, but it would be cool to serve with your own sidearm i remember myself, we had the G3 as standard rifle and the P38 as a sidearm, we were one of the last units, they do not have the G36 and the P8. I allways wanted so shoot the G36 and the P8, but mostly i wanted to bring my Sig.

Edit: Wasn't the P38, it was the P1.