The "Service" models have black Cerakoate, the "US Army" versions are Parkerized. As far as I know, that's the only difference (and the markings) between the two.
That’s the way I read it too. Temped to buy another just to “customize”. Would make a great spare truck gun for a cheap $$$
I’ve yet to find one of their HiPower clones to handle in a gun store. If they are as good as their 1911’s, I’ll definitely buy one.