A U.S. Air Force B-1 Lancer, 77th Weapons Squadron, Dyess Air Force Base, Texas, takes off during the U.S. Air Force Weapons School mission employment exercise, Dec. 5, 2011, at Nellis Air Force Base, Nev. The two-week-long mission employment phase is the final part of a five-and-a-half-month Weapons School graduate course that showcases the students newly acquired skills to test their ability to plan, execute and lead complex missions.