This is a simple modification of the stock eSim texture for US 1970 infantry. The only change is to substitute the helmet cover.
The sim's default green "leaf" pattern helmet cover became an icon symbolic of the Vietnam war. It was reversible, however, to this pattern, which was intended for arid, fall or winter (non snow) environments. (The U.S. Army, at the time, did not have an issue combat uniform specifically for such terrain). The camo patterns, collectively, have come to be called the "Mitchell" pattern.