FILE - In this Oct. 11, 2018, photo, an airplane hanger at Tyndall Air Force Base is damaged from hurricane Michael in Panama City, Fla. The U.S. military long has formally recognized climate change as a threat to national security. That's in part because of the impact that intensifying floods, wildfires, extreme heat and other natural disasters are having and will have on U.S. installations and troops around the world. (AP Photo/David Goldman, File)