"Wilson", ""Brewer", and "Vargas" are actually British S.F.S.G. troops; however, in the previous missions they are portrayed as US National Guard and the next mission after the mission they are featured in, they are portrayed once again as US National Guards. It is most likely that these troops were meant to be entirely different troops, but were named the same as the US National Guards by mistake.
Interestingly, Wilson does not appear with Brewer and Vargas on the next mission "Isolation". Although it is highly possible that he is one of the soldiers that run down the street while Sgt. Andrews' team meet up with his team.
The Sergeant says, "This article needs more content, so stop messing around and add to it right now!"