Eye for an eye

War has raged through out the world, as our technology has improved beyond expectations, the U.S as along with his allies have created a way to make people from the dead to come back alive but at a cost of others lives. Y/n is one of the people who is in the program. Y/n is one of the most important person in the war and could solve most of the problems around the world. As knowing this, the allies enemies wants him dead. Every time Y/n is assassinated the worst keeps happening as people he encounters seem to disappear.