Sgt. 1st Class Todd Teuling, Northern Strike opposing force (OPFOR) manager, carries ammo during NS 23-1, Jan. 26, 2023, at Camp Grayling, Mich.OPFOR is designed to build readiness for visiting units by introducing injects meant to challenge soldiers in a variety of ways. (U.S. National Guard photo by Staff Sgt. Tristan D. Viglianco)