F-15 Eagles from the Massachusetts Air National Guard's 104th Fighter Wing at Barnes Air National Guard Base in Westfield, Mass., lined up on the Nellis Air Force Base, Nev., Aug. 25 while participating in a Red Flag exercise. Red Flag offers pilots and ground crews training in actual wartime scenarios to increase their combat skills. (U.S. Air Force photo/Senior Master Sgt. Robert J. Sabonis)