U.S. Air Force firefighters prepare to enter a live

U.S. Air Force firefighters prepare to enter a live fire training structure during training as part of exercise Patriot Warrior at Sparta/Ft. McCoy Airport, Wis., August 11, 2016. Patriot Warrior is a joint exercise designed to demonstrate contingency deployment training ranging from bare base buildup to full operational capabilities. More than 11,000 members from the U.S. service branches and their Reserve components, including Air Force, Army, Navy, and Marines are participating alongside British, Canadian, and Saudi Arabian forces. (U.S. Air Force photo by Airman 1st Class Christopher Dyer)