A B-1 bomber assigned to the 37th Bomb Squadron rumbles off the flightline at Ellsworth Air Force Base, S.D., April 4, as part of a combat training mission over Fort Yukon, Alaska. The purpose of the exercise is to flex all major muscle movements during the planning and executing phase of a long range strike. (U.S. Air Force photo by Airman Hrair H. Palyan/Released)