U.S. Air Force Staff Sgt. Sean Dowd, 104th Fighter Wing, Massachusetts Air National Guard, speaks with Staff Sgt. Diane Berthiaume and Senior Airman Benjamin Digiammo, 104th FW, Mass. Air National Guard, as they perform pre-flight maintenance during Red Flag 12-2 Jan. 27, 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.