Senior Airman Stuart Brennan, member of the 911th Petroleum, Oil and Lubricants Flight, drains residue out of the fuel tank of an R-11 fuel truck at the Pittsburgh International Airport Air Reserve Station, Oct. 16, 2016. Brennan found that a fuel sample from the tank was cloudy and drained the contaminated fuel to prevent possible damage to the aircraft. (U.S. Air Force photo by Staff Sgt. Marjorie A. Bowlden)