Firefighters of the 48th Civil Engineer Squadron Fire Department spray a mock F-15 Eagle engine with water during live-fire training Aug. 13, 2014, at the burn pit on Royal Air Force Lakenheath, England. All firefighters are required to conduct live-fire training twice a year to avoid skill fade and keep their qualifications current. (U.S. Air Force photo/Airman 1st Class Trevor T. McBride)