Elsewhere in the Middle East, the U.S. Air Force has drone hubs in Qatar and the United Arab Emirates to conduct reconnaissance over the Persian Gulf. Twice since November, Iran has scrambled fighter jets to approach or fire on U.S. Predator drones that edged close to Iranian airspace.In Africa, the U.S. Air Force began flying unarmed drones over the Sahara five months ago to track al-Qaeda fighters and rebels in northern Mali. The Pentagon has also set up drone bases in Ethiopia, Djibouti and Seychelles. Even so, the commander of U.S. forces in Africa told Congress in February that he needed a 15-fold increase in surveillance, reconnaissance and intelligence-gathering on the continent.In an April speech, Deputy Defense Secretary Ashton B. Carter said the Pentagon is planning for the first time to send Reaper drones — a bigger, faster version of the Predator — to parts of Asia other than Afghanistan. He did not give details. A Defense Department spokeswoman said the military “hasn’t made any final decisions yet” but is “committed to increasing” its surveillance in Asia and the Pacific.