** FILE ** 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. (AP Photo/Lt. Col.. Leslie Pratt, US Air Force, File)

Photo by: Lt. Col. Leslie Pratt

** FILE ** 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. (AP Photo/Lt. Col.. Leslie Pratt, US Air Force, File)