Iraqi Kurdish soldiers check weapons in Dibega district near Irbil, Iraq, on Friday. U.S. aircraft have bombed Islamic State artillery attacking Kurdish forces near Irbil on Friday. Shang Le/Xinhua/Landov hide caption
An unmanned U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan, in 2010. A new report questions the U.S. policy of using armed drones abroad to carry out attacks on suspected terrorists. Kirsty Wigglesworth/AP hide caption
A U.S. drone in the sky over Kandahar Air Field in Afghanistan. Kirsty Wigglesworth/AP hide caption
A U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan. Kirsty Wigglesworth/AP hide caption
Pakistani Prime Minister Nawaz Sharif met with President Obama at the White House on Wednesday. Dennis Brack/pool/Getty Images hide caption
Last month, protesters in Multan, Pakistan, expressed their anger about U.S. drone strikes. S.S. Mirza/AFP/Getty Images hide caption
A Predator drone General Atomics/Getty Images hide caption
An American flag flying over Camp VI, where detainees are housed at the U.S. Naval Base at Guantanamo Bay. Bob Strong /Reuters /Landov hide caption
A Predator drone. General Atomics/Getty Images hide caption
A protest against drone strikes outside the Dirksen Senate Office Building in Washington last week. Jewel Samad/AFP/Getty Images hide caption
Former Vice President Dick Cheney in October 2011. Brendan Hoffman/Getty Images hide caption
An unmanned drone armed with Hellfire missiles is shown over southern Afghanistan. A Hellfire missile fired from a drone was used in 2011 to kill an American in Yemen who the Obama administration says was an al-Qaida leader. Another American died in that attack, and a 16-year-old American was killed in a separate drone strike. Lt. Col. Leslie Pratt/AP hide caption
John Brennan, President Obama's nominee to head the CIA, prepares to testify at his confirmation hearing before the Senate Intelligence Committee on Thursday. J. Scott Applewhite/AP hide caption