ELLSWORTH AIR FORCE BASE, S.D. -- Firefighters from the 28th Civil Engineer Squadron communicate the location of a simulated fire to one another during a Phase II Operational Readiness Exercise, May 12. The building was filled with non-toxic smoke to not only train Airmen on escaping, but to train firefighters on search and rescue tactics as well. (U.S. Air Force photo/Airman 1st Class Matthew Flynn)