ELLSWORTH AIR FORCE BASE, S.D. – (Left) Senior Airman Alexander Gerszewski, 28th Civil Engineer Squadron firefighter, communicates to Senior Airman Kenneth Colton, 28 CES firefighter, during a Phase II Operational Readiness Exercise, May 12. The firefighters responded to a simulated structural fire on base. (U.S. Air Force photo/Airman 1st Class Matthew Flynn)