LANGLEY AIR FORCE BASE, Va. -- Air Force One prepares to land on the flightline May 9. President Barack Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Staff Sgt. Christina M. Styer)

LANGLEY AIR FORCE BASE, Va. -- Air Force One taxis on the flightline during President Barack Obama's visit May 9. President Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Staff Sgt. Christina M. Styer)

LANGLEY AIR FORCE BASE, Va. -- President Barack Obama disembarks Air Force One May 9. President Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Senior Airman Dana Hill)

LANGLEY AIR FORCE BASE, Va. -- President Barack Obama is greeted by Virginia Governor Robert F. McDonnell May 9. President Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Senior Airman Dana Hill)

LANGLEY AIR FORCE BASE, Va. -- Lt. Gen. William Rew, Air Combat Command vice commander, and Col. Donald E. Kirkland, 633d Air Base Wing commander, salute the presidential motorcade during its' departure to Hampton University May 9. President Obama delivered the commencement address at the school, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Senior Airman Dana Hill)

LANGLEY AIR FORCE BASE, Va. -- Lt. Gen. William J. Rew, Air Combat Command vice commander, and Col. Donald E. Kirkland, 633d Air Base Wing commander, discuss the president’s visit May 9. President Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Staff Sgt. Christina M. Styer)

LANGLEY AIR FORCE BASE, Va. -- President Barack Obama returns to the flightline before departing May 9. President Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Staff Sgt. Christina M. Styer)

LANGLEY AIR FORCE BASE, Va. -- President Barack Obama greets personnel on the flightline during a visit May 9. President Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Staff Sgt. Christina M. Styer)

LANGLEY AIR FORCE BASE, Va. -- President Barack Obama bids farewell to the crowd of enthused Team Langley members during his first visit to Langley May 9. President Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Senior Airman Dana Hill)

LANGLEY AIR FORCE BASE, Va. -- President Barack Obama bids farewell to the crowd of enthused Team Langley members during his first visit to Langley May 9. President Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Senior Airman Dana Hill)

LANGLEY AIR FORCE BASE, Va. – Col. Donald E. Kirkland, 633d Air Base Wing commander, and spectators watch as President Barack Obama departs May 9. President Obama delivered the commencement address at nearby Hampton University, emphasizing the importance of education and good citizenship to graduates. (U.S. Air Force photo/Staff Sgt. Christina M. Styer)