In this undated handout file photo provided by the U.S. Air Force, an MQ-9 Reaper, armed with GBU-12 Paveway II laser guided munitions and AGM-114 Hellfire missiles, is piloted by Col. Lex Turner during a combat mission over southern Afghanistan. An instruction on camouflaging cars is one of 22 tips on how to avoid drones, listed on a document left behind by the Islamic extremists as they fled northern Mali from a French military intervention in January. The tip sheet, found Feb. 6, 2013 by an AP reporter in Timbuktu, reflects how al-Qaidas chapter in North Africa anticipated a military intervention that would make use of drones, as the battleground in the war on terror worldwide is shifting from boots on the ground to unmanned planes in the air.(AP Photo/Lt. Col.. Leslie Pratt, US Air Force, File)