Airman Jefre Turcios-Rivera, a heating ventilation air conditioning and refrigeration technician assigned to the 28th Civil Engineer Squadron, pulls a hose over a railing during the annual Firefighter Challenge at Ellsworth Air Force Base, S.D., Oct. 6, 2017. The Firefighter Challenge included five obstacles where teams of four tried to complete the course with the fastest time possible. (U.S. Air Force photo by Airman 1st Class Thomas Karol)