U.S. Air Force Senior Airman Benjamin Digiammo, 104th Fighter Wing avionics journeyman, Massachusetts Air National Guard, conducts pre-flight maintenance in the cockpit of a F-15E Strike Eagle 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, Massachusetts, Oklahoma, Republic of Korea and Kingdom of Saudi Arabia.