The USAF Thunderbirds put on an impressive display of formation and maneuvers for the crowd Friday afternoon. The 2012 Shaw Air Expo is this weekend at Shaw Air Force Base in Sumter, S.C. Shaw's annual expo includes aerial demonstrations from with thunderbirds and other airplanes, static displays to tour and children's activities. KIM KIM FOSTER-TOBIN — kkfoster@thestate.com Buy Photo