Gary Samore, President Obama's chief adviser on weapons of mass destruction and arms control, told the New York Times he thinks it would take Tehran "roughly a year" to turn low-enriched uranium into weapons-grade material. (AP Photo/Eraldo Peres, File)
In this Aug. 20, 2009, file photo, hundreds of Libyans welcome Libyan Abdel Baset al-Megrahi, who found guilty of the 1988 Lockerbie bombing, top left, as he is accompanied by Seif al-Islam el- Gadhafi, son of Libyan leader Libyan leader Moammar Gadhafi upon his arrival at airport in Tripoli, Libya, after Scotland freed the terminally ill Lockerbie bomber on compassionate grounds. (AP Photo/Amr Nabil, File)
ASSOCIATED PRESS PHOTOGRAPHS U.S. Army Sgt. Jason Thompson (left) and Lt. Col. Nate Flegler wave to one of the last Stryker armored vehicles to leave Iraq.
Soldiers keep watch as members of the 4th Stryker Brigade, 2nd Infantry Division depart from Iraq. Some 50,000 will stay in Iraq another year in a noncombat role.
ASSOCIATED PRESS PHOTOGRAPHS At top, Afghan policemen watch a NATO vehicle burn in late July after a convoy was hit by a suicide attack in Jalalabad. Arab and other foreign fighters with ties to al Qaeda are infiltrating the mountains of eastern Afghanistan.Afghan firemen try to extinguish a burning oil tanker in early June after an explosive device planted under it exploded near a NATO air base in Jalalabad, east of Kabul.
U.S. Army Sgt. Jason Thompson, left, and Lt. Col. Nate Flegler, right, wave to one of the last Stryker armored vehicles to leave Iraq as it crosses the border into Kuwait at the Khabari border crossing, Thursday, Aug. 19, 2010. The U.S. Army's 4th Brigade, 2nd Infantry Division is the last combat brigade to leave Iraq as part of the drawdown of U.S. forces. (AP Photo/ Maya Alleruzzo)
U.S. Army Spc. Luisito Brooks gives a thumbs-up to the last Stryker armored vehicle of the 4th Brigade to leave Iraq, as it crosses the border into Kuwait at the Khabari border crossing, Thursday, Aug. 19, 2010. The U.S. Army's 4th Brigade, 2nd Infantry Division is the last combat brigade to leave Iraq as part of the drawdown of U.S. forces. (AP Photo/ Maya Alleruzzo)
** FILE ** In this Aug. 16, 2010, photo, U.S. Army soldiers from the 4th Battalion, 9th Infantry Regiment pose with an American flag for a photograph after crossing the border from Iraq into Kuwait. The soldiers are the last combat brigade to leave Iraq as part of the drawdown of U.S. forces. (AP Photo/Maya Alleruzzo)
In this Aug. 16, 2010 photo, U.S. Army Staff Sgt. Jackie Vanover, from Spanaway, Wash. holds a hand-made message for his family, including his two-month-old daughter, Austin, after crossing the border from Iraq into Kuwait. Staff Sgt. Vanover, of 4th Battalion, 9th Infantry Regiment, 4th Brigade, 2nd Infantry Division, is in the last combat brigade to leave Iraq as part of the drawdown of U.S. forces. (AP Photo/ Maya Alleruzzo)
