Staff Sgt. Gabriel Castillo, a U.S. Air Force crew chief with the 4th Fighter Wing at Seymor Johnson Air Force Base, N.C., stands by to marshall an F-15 Strike Eagle to its parking spot on the Kentucky Air National Guard Base flightline in Louisville, Ky., on April 15, 2010. The F-15 will participate in this weekend's Thunder Over Louisville airshow. (U.S. Air Force photo by Senior Airman Maxwell A. Rechel)