A B-1 bomber takes off for the Global Strike Challenge at Ellsworth Air Force Base, S.D., Sept. 18, 2014. Twelve bases are participating in the competition, with more than 400 airmen competing to earn their base trophies that will be awarded in early Nov. during a symposium at Barksdale Air Force Base, La. (U.S. Air Force photo by Airman 1st Class Rebecca Imwalle/Released)