5/6/2012 - U.S. Air Force Air Demonstration Squadron "Thunderbirds" race across the sky during a performance at the Shaw Air Expo, Shaw Air Force Base, S.C., May 5, 2012. The group is known for their high-flying and tactical maneuvers. (U.S. Air Force photo by Airman Nicole Sikorski/Released)

5/6/2012 - U.S. Air Force Air Demonstration Squadron "Thunderbirds" speed upwards into the sky during a performance at the Shaw Air Expo, Shaw Air Force Base, S.C., May 5, 2012. The Thunderbirds perform more than 88 air demonstrations each year across the U.S. (U.S. Air Force photo by Airman Nicole Sikorski/Released)

5/6/2012 - U.S. Air Force Air Demonstration Squadron "Thunderbirds" pilots salute crowd members to signify completion of their performance at the Shaw Air Expo, Shaw Air Force Base, S.C., May 5, 2012. The Thunderbirds perform more than 88 air demonstrations each year across the U.S.(U.S. Air Force photo by Airman Nicole Sikorski/Released)

5/6/2012 - U.S. Air Force Lt. Col. Gregory Mosley, U.S. Air Force Air Demonstration Squadron "Thunderbirds" commander, reads the oath of enlistment during the 2012 Shaw Air Expo, Shaw Air Force Base, S.C., May 5, 2012. After taking this oath, these soon to be Airmen will be departing for U.S. Air Force Basic Military Training.(U.S. Air Force photo by Airman Nicole Sikorski/Released)

5/6/2012 - - U.S. Air Force Air Demonstration Squadron "Thunderbirds" takeoff from Shaw Air Force Base, S.C., during the 2012 Shaw Air Expo on May 5, 2012. The Thunderbirds performance, along with the U.S. Army Golden Knights, were the highlight the aerial acts that participated in the biennial event. (U.S. Air Force photo by Airman Nicole Sikorski/Released)

5/6/2012 - Crowd members gather and gaze at the performance of the U.S. Air Force Air Demonstration Squadron "Thunderbirds" during the Shaw Air Expo held at Shaw Air Force Base, S.C., May 5, 2012. (U.S. Air Force photo by Airman Nicole Sikorski/Released)

5/6/2012 - U.S. Air Force Air Demonstration Squadron "Thunderbirds" conduct tactical and difficult maneuvers while participating at the Shaw Air Expo at Shaw Air Force Base, S.C., May 5, 2012. The Thunderbirds and U.S. Army Golden Knights highlighted the biennial event. (U.S. Air Force photo by Airman Nicole Sikorski/Released)

5/6/2012 - U.S. Air Force Air Demonstration Squadron "Thunderbirds" pose for a photo with recent enlistees while at the Shaw Air Expo, Shaw Air Force Base, S.C., May 5, 2012. In addition to more than 80 air demonstrations each year, the Thunderbirds also conduct enlistments, re-enlistments and speak at local high schools when visiting an area near one of their performances. (U.S. Air Force photo by Airman Nicole Sikorski/Released)