OK, I'll return to those later. Everyone hates MPs anyway.
Now for something exotic.
The 6941st Guard Battalion was a unit raised from German nationals to provide security at US installations in the city. As such all the barracks, McNair, Turner, Andrews etc along with US schools, PXs and married quarters were guarded by members of this semi-civilian unit. They were howver also organised to function as sort of bare bones light infantry battalion. Nothing in the way of heavy weapons but another source of defenders. The uniforms they wore were US cast-offs, so the old OG-107 uniform was still in evidence and the older Mitchell pattern helmet covers. I used the old Eureka US Army in MOPP gear as the basis for pretty basic conversions.