U.S. Air Force Tech. Sgt. Michael Ginzel and Staff Sgt. Michael Hendrickson, 127th Maintenance Squadron crew chiefs, perform interior lighting operations checks on an A-10 Thunderbolt II aircraft during Red Flag 11-3 at Nellis Air Force Base, Nev., on March 1, 2011. Red Flag is an advanced aerial combat training exercise held four to six times a year to train pilots from the U.S., NATO and other allied countries for real combat situations.