A B-1 bomber takes off for a training mission during an Operational Readiness Exercise at Ellsworth Air Force Base, S.D., March 15, 2012. Ellsworth Airmen generated several B-1 sorties to test the wing’s ability to effectively and efficiently mobilize its aircraft, personnel and resources. (U.S. Air Force photo by Airman 1st Class Anania Tekurio/Released)