Senior Airman Jimmy Ashburn, 2nd Maintenance Squadron Aerospace Ground Equipment flight, removes an air duct from a new generation heater after conducting an operations check on Barksdale Air Force Base, La., March 19. During the operations check, AGE Airmen ensure the heater is operational by checking for carbon monoxide emissions and smoke from the exhaust. (U.S. Air Force photo/Airman 1st Class Benjamin Gonsier)(RELEASED)