U.S. Air Force Capt. Seth Westfall, left, and Capt. Matthew Gabso, 39th Airlift Squadron C-130J Super Hercules pilots, begin to conduct preflight checks while wearing mission oriented protective posture gear during an exercise that simulated a chemical attack on the airfield at Dyess Air Force Base, Texas, May 23, 2018. During the exercise, Airmen were tested on their ability to survive and operate in a simulated chemical exposed environment. (U.S. Air Force photo by Airman 1st Class Mercedes Porter)