Airman 1st Class Christopher Love, 28th Aircraft Maintenance Squadron crew chief, services a B-1B Lancer with gaseous nitrogen keeping it ready to fly on Ellsworth Air Force Base, S.D., Sept. 8, 2011. Love was receiving B-1 specific training to prepare him to compete in the Global Strike Challenge. Operations, bomber and security forces teams from bomber and missile wings compete in the challenge to showcase their expertise, skill and capabilities. (U.S. Air Force photo by Airman 1st Class Kate Thornton/Released)