Penguin. troops in the military, all branches, belong to a unit of some kind. You are not an individual just bouncing around by yourself to be considered individually by the "machine". If their unit, when they are through with their current assignment, gets shipped back to the war zone, they will go with it. What their commanders decide to do with his troops determines what they will be doing. Unless they leave the service they are still subject to perform all missions their unit is assigned.