Afghan National Security Adviser Mohammad Hanif Atmar (right) and U.S. Ambassador to Afghanistan James Cunningham exchange documents after signing the Bilateral Security Agreement, with Afghan President Ashraf Ghani (rear, left) and Chief Executive Abdullah Abdullah in the background. Jawad Jalali/EPA/Landov hide caption
University of California President Janet Napolitano. Mandel Ngan/AFP/Getty Images hide caption
Ashraf Ghani (second from left) stands next to Afghanistan's Chief Executive Abdullah Abdullah (left) and two deputy officials as he takes the oath during the inauguration ceremony at the presidential palace in Kabul on Monday. Ahmad Massoud/Xinhua/Landov hide caption
Travelers lined up Friday to reschedule flights at Chicago's O'Hare International Airport after the region's air traffic control was sabotaged. More flights are resuming Saturday, but hundreds were also canceled. Scott Olson/Getty Images hide caption
British Prime Minister David Cameron addresses the Houses of Parliament on Friday. He urged MPs to authorize the U.K.'s participation in anti-ISIS airstrikes. PA/EPA/Landov hide caption
An A-18C Hornet attached to Strike Fighter Squadron (VFA) 87, prepares to launch from the flight deck of the aircraft carrier USS George H.W. Bush (CVN 77) to conduct strike missions against Islamic State group targets. Robert Burck/AP hide caption
Sheikh Abdullah bin Bayyah is interviewed about his fatwa explaining why ISIS is wrong to claim that Islam supports violence and the establishment of a caliphate by force. Dina Temple-Raston/NPR hide caption
The U.N. Security Council on Wednesday unanimously approved a historic resolution aimed at ending the flow of foreign extremists to the world's conflicts. President Obama thanked the council but warned that "a resolution alone will not be enough." Julie Jacobson/AP hide caption
This still image was made from video released by the U.S. military on Tuesday that shows a building hit by a U.S. airstrike in Tall Al Qitar, Syria. The U.S. is describing the bombing campaign in Syria and Iraq as a counterterrorism operation and not a war. U.S. Central Command/AP hide caption
President Obama addresses the 69th session of the United Nations General Assembly, at U.N. headquarters in New York on Wednesday. Richard Drew/AP hide caption
The chamber of the House of Representatives empties following a joint meeting of Congress with visiting Ukrainian President Petro Poroshenko on Sept. 18. J. Scott Applewhite/AP hide caption
Lt. Gen. William C. Mayville Jr., Joint Staff Director of Operations, speaks about airstrikes in Syria during a briefing at the Pentagon yesterday. Brendan Smialowski/AFP/Getty Images hide caption
President Obama speaks Tuesday about the participation of five Arab nations in airstrikes against militants in Syria. Carolyn Kaster/AP hide caption
A photo released by the U.S. Navy shows the guided-missile cruiser USS Philippine Sea launching a Tomahawk cruise missile against Islamic State targets in Syria on Tuesday. Eric Garst/U.S. Navy/EPA/Landov hide caption
President Obama signs H.J. Res 124, which includes appropriations to train and arm moderate Syrian rebels. For now, the effort will be paid for from an account meant to wind down the war in Afghanistan. Evan Vucci/AP hide caption