A policeman signals Thursday that a road in central London is closed after a suspect vehicle was abandoned near Downing Street. A terrorist plot to launch Mumbai-style attacks on Britain and other European countries has been intercepted by intelligence agencies. Dan Kitwood/Getty Images hide caption
Secretary of Defense Robert Gates speaks at Duke University in Durham, N.C., Wednesday, Sept. 29, 2010. Jim R. Bounds/Associated Press hide caption
circa 1785: General Nathanael Greene (1742 - 1786) of the Continental Army. Hulton Archive/Hulton Archive hide caption
Pedro Leonardo Mascheroni, photographed at his home in October 2009, was indicted on federal charges of communicating classified nuclear weapons data. Heather Clark/AP hide caption
Sgt. 1st Class Phillip Carroll, with the 101st Airborne Division, patrols in the Arghandab River valley outside Kandahar, Afghanistan, this week. Debate in Washington is growing over the scope and duration of continued U.S. military operations in Afghanistan. David Gilkey/NPR hide caption
Emma and Christopher Winfield at their home in Cape Coral, Fla., on Sept. 3. Their son, U.S. Army Spc. Adam Winfield, is accused of murdering civilians during his deployment to Afghanistan, a charge he and his family firmly refute. Erik Kellar/AP hide caption
Soldiers monitor computer screens inside the U.S. Central Command's mobile headquarters, in this U.S. military photo from 2002. A major concern regarding cyber warfare is the difficulty in distinguishing military targets from civilian targets. Gary P. Bonaccorso/Getty Images hide caption
The audience at New York University's Skirball Center for the Performing Arts voted 55 percent against the motion "Treat Terrorists Like Enemy Combatants, Not Criminals" after the Sept. 14 debate. Chris Vultaggio hide caption