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.
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.
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