FILE - In this Jan. 31, 2010 file photo an unmanned U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan, on a moon-lit night. White House attempts to lift the cloak

 

              FILE - In this Jan. 31, 2010 file photo an unmanned U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan, on a moon-lit night. White House attempts to lift the cloak
FILE - In this Jan. 31, 2010 file photo an unmanned U.S. Predator drone flies over Kandahar Air Field, southern Afghanistan, on a moon-lit night. White House attempts to lift the cloak of secrecy over its use of armed drones have only raised more questions about the counterterrorism program, particularly President Barack Obama's legal authority to kill American citizens. (AP Photo/Kirsty Wigglesworth, File)