It's part of our RKBA and our heritage that we can have war souvenirs.
Unfortunately Uncle Sam really curtailed that during the Vietnam War. We weren't allowed to bring back any kind of firearms with us as we left Iraq in 1991. And the guys that served in A-Stan were only allowed to bring back gun if they were considered antiques by the ATF.
When I was clearing bunkers after the cease fire in 1991 I found bunkers full of AK's and pistols. One bunker had crates upon crates of brand new/unissued Hungarian FEG Hi Power pistols. We had to destroy every last one of them.