U.S. Air Force Airman 1st Class Scott Kolar, 633rd Civil Engineer Squadron firefighter, uses a 10-pound hammer to move a 160-pound sled during a firefighter challenge at Langley Air Force Base, Va., Oct. 1, 2014. In the sixth year of the challenge, 59 firefighters were tested on their strength and stamina as they completed essential tasks used for fighting fires. (U.S. Air Force photo by Senior Airman Kayla Newman/Released)