The Universal Soldier program known as Operation Black Tower was started during the Vietnam war. It was created to make the perfect soldier, one that doesn't feel fear, doesn't feel pain, and follows every order without question. They are superior in almost every way to a normal human. They are smarter, faster, stronger, and are almost impossible to kill.

But after the Universal Soldier incident in 1991, the program was shut down... officially. But unofficially it was continued. And after the incident with Sunset Shimmer at Canterlot High, the United States Government finds the perfect opportunity to test the Next Generation Universal Soldiers.

GR-3-5, one of the remaining first generation Universal Soldiers, is ordered, along with eight Generation 3 Universal Soldiers, and 2 of the brand new Generation 7's, to accompany a small team of scientists and Marines to Equestria. As usual... things don't go according to plan.

Universal Soldier X My Little Pony: FiM Crossover

(Likeness to actual events is purely coincidental unless it isn't.