Charleston AFB C-17's fly as part of a 13 aircraft formation training exercise here Dec. 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission included airdrops over North Auxiliary Airfield in Orangeburg, S.C., and aerial refueling training. (U.S. Air Force photo/Staff Sgt. Marie Cassetty)

A Charleston AFB C-17 takes off as part of a 13 aircraft formation training mission here Dec. 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission included airdrops over North Auxiliary Airfield in Orangeburg, S.C., and aerial refueling training. (U.S. Air Force photo/Staff Sgt. Marie Cassetty)

A Charleston AFB C-17 takes off as part of a 13 aircraft formation training mission here Dec. 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission included airdrops over North Auxiliary Airfield in Orangeburg, S.C., and aerial refueling training. (U.S. Air Force photo/Staff Sgt. Marie Cassetty)

Charleston AFB C-17's taxi on the flight line prior to being cleared for takeoff as part of a 13 aircraft formation training mission here Dec. 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission included airdrops over North Auxiliary Airfield in Orangeburg, S.C., and aerial refueling training. (U.S. Air Force photo/Staff Sgt. Marie Cassetty)

Charleston AFB C-17's taxi on the flight line prior to being cleared for takeoff as part of a 13 aircraft formation training mission here Dec. 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission included airdrops over North Auxiliary Airfield in Orangeburg, S.C., and aerial refueling training. (U.S. Air Force photo/Staff Sgt. Marie Cassetty)

Charleston AFB C-17's taxi on the flight line prior to being cleared for takeoff as part of a 13 aircraft formation training mission here Dec. 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission included airdrops over North Auxiliary Airfield in Orangeburg, S.C., and aerial refueling training. (U.S. Air Force photo/Staff Sgt. Marie Cassetty)

One of 13 C-17's sits on the flight line prior to taxi as part of a 13 aircraft formation training mission Dec. 18 at Charleston AFB. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission included airdrops over North Auxiliary Airfield in Orangeburg, S.C., and aerial refueling training. (U.S. Air Force photo/Staff Sgt. Marie Cassetty)

Charleston AFB C-17s perform an airdrop training mission as part of a 13-aircraft formation training exercise at North Auxiliary Field, Orangeburg, S.C., Dec 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission also included aerial refueling. (U.S. Air Force photo/Senior Airman Timothy Taylor)

Charleston AFB C-17s perform an airdrop training mission as part of a 13-aircraft formation training exercise at North Auxiliary Field, Orangeburg, S.C., Dec 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission also included aerial refueling. (U.S. Air Force photo/Senior Airman Timothy Taylor)

Charleston AFB C-17s perform an airdrop training mission as part of a 13-aircraft formation training exercise at North Auxiliary Field, Orangeburg, S.C., Dec 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission also included aerial refueling. (U.S. Air Force photo/Senior Airman Timothy Taylor)

The first C-17 lands on the Charleston AFB flightline after completing the 13-aircraft formation training exercise Dec 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission also included aerial refueling. (U.S. Air Force photo/Senior Airman Timothy Taylor)

Charleston AFB C-17s fly as part of a 13-aircraft formation training exercise here Dec. 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission included airdrops over North Auxiliary Airfield in Orangeburg, S.C., and aerial refueling training. (U.S. Air Force photo/Airman 1st Class Katie Gieratz)

Charleston AFB C-17s fly over the Arthur Ravenel bridge, as part of a 13-aircraft formation training exercise Dec. 18. The formation flight demonstrated the U.S. Air Force's strategic capability. The training mission included airdrops over North Auxiliary Airfield in Orangeburg, S.C., and aerial refueling training. (U.S. Air Force photo/Airman 1st Class Katie Gieratz)

A Formation of U.S. Air Force C-17 Globemaster III's from the 437th Airlift Wing airdrop cargo to North Field, S.C., December 18th, 2008. The 437th Airlift Wing conducted a large formation exercise utilizing 13 C-17 Globemaster III aircraft. The aim of the exercise is to maintain the ability of the Air Force to drop the equivalent of an Army Brigade within 30 minutes. (U.S. Air Force photo by Staff Sgt. James L. Harper Jr.)Released

A Formation of U.S. Air Force C-17 Globemaster III's from the 437th Airlift Wing fly over the Ravenel Bridge in Charleston S.C., December 18th, 2008. The 437th Airlift Wing conducted a large formation exercise utilizing 13 C-17 Globemaster III aircraft. The aim of the exercise is to maintain the ability of the Air Force to drop the equivalent of an Army Brigade within 30 minutes. (U.S. Air Force photo by Staff Sgt. James L. Harper Jr.)Released

C-17s from the 437th and 315th Airlift Wings fly over the Arthur Ravenel Jr. Bridge during a training sortie involving a 13-ship formation Dec. 18. This multi-ship training demonstrates the teamwork of active-duty Airmen, Reservists and civilians to be mission-ready when the nation needs this critical capability. (U.S. Air Force photo/ Tech. Sgt. Norma Gonthier)

C-17s from Charleston AFB fly over the Arthur Ravenel Jr. Bridge Dec. 18. C-17s from the 437th and 315th Airlift Wings dropped cargo at a remote airfield during a strategic brigade airdrop exercise involving a 13-ship formation. This multi-ship training demonstrates the teamwork of active-duty Airmen, Reservists and civilians to be mission-ready when the nation needs this critical capability. (U.S. Air Force photo/Staff Sgt. Richard Rose)

C-17 Globemaster IIIs from the 437th and 315th airlift wings drop cargo at a remote airfield during a strategic brigade airdrop exercise involving a 13-ship formation Dec. 18 from Charleston Air Force Base, S.C. C-17s must be able to meet the Army's goal of airdropping a brigade's worth of troops and equipment (about 3,250 Soldiers and 3,450 tons of equipment). Charleston AFB aircraft currently account for half of the Air Force strategic brigade airdrop requirement. (U.S. Air Force photo/Tech. Sgt. Jeremy Lock)

C-17 Globemaster IIIs from the 437th and 315th airlift wings drop cargo at a remote airfield during a strategic brigade airdrop exercise involving a 13-ship formation Dec. 18 from Charleston Air Force Base, S.C. C-17s must be able to meet the Army's goal of airdropping a brigade's worth of troops and equipment (about 3,250 Soldiers and 3,450 tons of equipment). Charleston AFB aircraft currently account for half of the Air Force strategic brigade airdrop requirement. (U.S. Air Force photo/Tech. Sgt. William Greer)

Globemaster IIIs from the 437th and 315th airlift wings drop cargo at a remote airfield during a strategic brigade airdrop exercise involving a 13-ship formation Dec. 18 from Charleston Air Force Base, S.C. C-17s must be able to meet the Army's goal of airdropping a brigade's worth of troops and equipment (about 3,250 Soldiers and 3,450 tons of equipment). Charleston AFB aircraft currently account for half of the Air Force strategic brigade airdrop requirement. (U.S. Air Force photo/Tech. Sgt. William Greer)