NELLIS AIR FORCE BASE, Nev. -- A Republic of Singapore Air Force crew chief uses hand signals to direct an F-16CG pilot to stop on the Nellis flight line, July 29, 2010 during Red Flag 10-4. The RSAF is stationed at Luke AFB, pilots and maintenance personnel are assigned to the 425th for two years, during which they receive advanced tactics training by participating in Red Flag exercises. (U.S. Air Force photo/Lawrence Crespo)
