Ellsworth Airmen return to Ellsworth Air Force Base, S.D., following their participation in Green Flag, an exercise designed to test their ability to survive and operate in a wartime environment, May 24, 2012. B-1 aircrews from the 37th Bomb Squadron and a myriad of support personnel participated in the exercise conducted at Nellis Air Force Base, Nev., the final scrimmage before heading downrange to Southwest Asia later this year. (U.S. Air Force photo by Airman 1st Class Zachary Hada/Released)