MARSOC tested the Colt submittals to failure (little cleaning/lubrication, firing full of dirt/sand/mud). That was the point of the test. And Colt still won.
Colt "won" because the requirements of the competition basically mandated it be a 1911 style pistol without actually using the term 1911. It had to even be able to use 1911 mags currently in stock. If a 1911 is what you want, might as well be Colt.
As others have mentioned, the mandate is that it must be made
in the US, not that it has to be made by a US company. That is why FN, HK, Beretta, etc. have plants in this country, to satisfy those orders.