A US Air Force F-15 fighter jet shot down a drone said to have come from Iran after it was deemed a threat to troops stationed in eastern Syria Saturday. 'Coalition aircraft successfully engaged and defeated a UAS through air to air engagement in the vicinity of Mission Support Site Green Village,' US Army Colonel Wayne Marotto, who heads the US-led coalition against ISIS, told Reuters, using an acronym for an unmanned aircraft system. Fox News reporter Lucas Tomlinson said an F-15E shot the 'Iranian' drone, which flew 'too close' to the 900 US troops in the area,,,,