The Glock, M&P, or XD would be a much better option in the circumstance. Since most Marines are within the ages group of 18-26, it would be easier to teach young Marines how to use and maintain a pistol that is just downright easier to disassemble. However, I know the Glock doesn't meet the military standards (mainly a thumb safety) but I think some thinking outside the box was in order here.
I love the 1911 pistol but for combat these days, there are some better options.