Try this Testors link, Eric. There are many semi-gloss and a few gloss paints in military colors available from them. The majority of the semi-gloss colors, though, appear to be in the German and Russian side of the house. I just painted my ICM BS-3 100mm field artillery piece Russian Armor Green. Turns out it was semi-gloss, but gloss enough that I could have put decals on it with no additional gloss coats.
http://www.testors.com/catalog_browse.asp?ictNbr=42
Hope this helps you some.
Gip Winecoff