LOL!! I guess I've watched too many movies lately.
My son served in Germany. Guarded armory and wired vehicle holding pens with unloaded weapons. Didn't want to start and international incidident, etc..
I did the same, but with a very small ammo supply,but not zero.
At the time, it was the Cold War, our enemy was East Germany/USSR
The point was routinely reinforced, the equipent we guarded, was confidential coded electronic communication gear.
May 1970 Kent State, was a tragedy. Following that, military police crowd control became much better.