Air defenses failed to stop an attack on a U.S. military outpost in Jordan on Sunday that killed three American soldiers at least in part because the hostile drone approached its target at the same time an American drone was returning to the base‚ two U.S. officials said on Monday. The enemy drone was mistaken for an American surveillance drone returning to the remote resupply base‚ and air defenses were not immediately engaged‚ according to the officials‚ who spoke on the condition of...