U.S. Air Force airmen, 104th Fighter Wing, Massachusetts Air National Guard, prepare for F-15E Strike Eagles to return from a training mission during Red Flag 12-2 Jan. 24, 2012, at Nellis Air Force Base, Nev. Red Flag is a realistic combat training exercise involving the air forces of the United States and its allies. The Exercise includes units from Nevada, Colorado, South Dakota, Louisiana, Utah, California, Republic of Korea, Kingdom of Saudi Arabia, Massachusetts and Oklahoma.