U.S. Air Force crew chiefs prepare a B-1B Lancer aircraft for a mission. U.S. Air Force crew chiefs from the 7th Maintenance Operations Squadron and the 9th Bomb Squadron prepare a B-1B Lancer aircraft for a mission during an operational readiness exercise at Dyess Air Force Base, Texas, on Jan. 11, 2006. The readiness exercise is design to improve war-fighting skills. SHARE: Download: Full Size (0.03 MB) Credit: VIRIN: 535626-E-WAU89-542.jpg Photo Gallery