This has been done awhile, but as usual with me the most minor of things held up from declaring this being done.
It was the belt.
In the comics it's a very well defined thing, but in the movie it was barely at all noticeable.
So I've opted for a limited but still semi-visible one... which I felt obligated to do as there's not much of anything other than a belt to show team colors from the back.
Enjoy!
https://www.mediafire.com/file/724wlpqctfbzgaz/SoldierBAdam.zip