190603-F-DX695-1092
Tech. Sgt. Angelo Viniegra, 2nd Civil Engineer Squadron crew chief, observes Airmen during a vertical ventilation training session at Barksdale Air Force Base, La., June 3, 2019. Vertical ventilation is when a hole is created in the roof of a structure during real world scenarios to contain fires, cool off buildings and provide better visibility. (U.S. Air Force photo by Senior Airman Tessa B. Corrick)