3/29/2010 - The President of the United States Barack Obama visits the troops at Bagram Airfield, Afghanistan, March 28, 2010. (U.S. Air Force photo by/ Tech. Sgt. Jeromy K. Cross/released)

3/29/2010 - The President of the United States Barack Obama visits the troops at Bagram Airfield, Afghanistan, March 28, 2010. (U.S. Air Force photo by/ Tech. Sgt. Jeromy K. Cross/released)

3/29/2010 - The President of the United States Barack Obama visits the troops at Bagram Airfield, Afghanistan, March 28, 2010. (U.S. Air Force photo by/ Tech. Sgt. Jeromy K. Cross/released)

3/29/2010 - The President of the United States Barack Obama visits the troops at Bagram Airfield, Afghanistan, March 28, 2010. (U.S. Air Force photo by/ Tech. Sgt. Jeromy K. Cross/released)

3/29/2010 - The President of the United States Barack Obama visits the troops at Bagram Airfield, Afghanistan, March 28, 2010. (U.S. Air Force photo by/ Tech. Sgt. Jeromy K. Cross/released)

3/29/2010 - The President of the United States Barack Obama visits the troops at Bagram Airfield, Afghanistan, March 28, 2010. (U.S. Air Force photo by/ Tech. Sgt. Jeromy K. Cross/released)

3/29/2010 - The President of the United States Barack Obama visits the troops at Bagram Airfield, Afghanistan, March 28, 2010. (U.S. Air Force photo by/ Tech. Sgt. Jeromy K. Cross/released)