Originally Posted by
VAMarine
The standard issue sidearm of the US forces from 1911 to 1985 was the M1911, Colt was the primary manufacturer although there were a couple others during war time (WWI and WWIII) if it was a semi-automatic, it was probably a Colt as that fits his recollection, but then again I've heard some old timers refer to any 1911 as a Colt when they weren't.
There were some revolvers scattered about the US Military during that time, there were Colt and S&W revolvers chambered in .45ACP, and some .38 models here and there, but as an MP, I'd wager it was a 1911 of some sort.