U.S. Airmen assigned to the 355th Civil Engineer Squadron and firefighters from Green Valley Fire District prepare to enter into a burn house at Davis-Monthan Air Force Base, Ariz., Aug. 24, 2016. Members of the 355th CES’s Fire and Emergency Services and the Green Valley Fire District participated in live-fire Class A training over the course of four days on D-M AFB’s fire training grounds. (U.S. Air Force photo by Airman 1st Class Mya M. Crosby)