ELLSWORTH AIR FORCE BASE, S.D. -- (Left) Senior Airmen Jared Manning and John Vasquez, 28th Civil Engineer Squadron firefighters, go to ignite a fire during a night structural fire training exercise, Feb. 17. The simulated structural fires allow firefighters to safely practice extinguishing fires to maintain operational readiness. (U.S. Air Force photo/Airman 1st Class Corey Hook)