A U.S. Air Force firefighter lights the burn pit at

A U.S. Air Force firefighter lights the burn pit at the Silver Flag Exercise Site, located at Tyndall Air Force Base, Fla., June 23, 2016. The burn pit is used to simulate aircraft fires and can burn so hot that the flames can only be approached while wearing multiple layers of fire protection. The Silver Flag exercise site is run by the Det. 1, 823rd REDHORSE, and the squadron's 74-person cadre provides contingency combat support training to active-duty, reserve and Air National Guard Airmen, Army, Marine Corps and allied nations mission support group personnel. More than 4,500 Airmen are trained each year at the site. (U.S. Air Force photo by Airman 1st Class Cody R. Miller/Released)