U.S. Air Force Airman 1st Class Justin Hildreth provides pre-flight maintenance for a B-1B Lancer during Red Flag 12-2 at Nellis Air Force Base, Nev., on Jan. 24, 2012. Hildreth is an aerospace propulsion journeyman assigned to the 28th Aircraft Maintenance Squadron at Ellsworth Air Force Base, S.D. Red Flag is a realistic combat training exercise involving airmen from Nevada, Colorado, South Dakota, Louisiana, Utah, California, South Korea, Massachusetts, Oklahoma and Saudi Arabia.