U.S. Air Force HVAC specialist, Staff Sgt. Corina Thornton assigned to the 433rd Civil Engineer Squadron, Lackland, AFB, Texas installs a field deployable environmental control unit, May 5, 2014 during Exercise Patriot Warrior at Fort McCoy, Wis. United States military reserve components from all branches participate in combined exercises Patriot Warrior, Global Medic, Diamond Saber and CSTX in preparation for upcoming deployments in joint environments. (U.S. Air Force photo by Master Sgt. Francisco V. Govea II/ Released)