As Syria's rebel coalition expands its fight against the Islamic State, so too does it appear that the United States is expanding its support of the rebels. Low-resolution satellite imagery taken Dec. 28 shows construction underway to extend the runway at an airfield in Rmeilan, al-Hasaka province, which would prepare the site to accommodate larger aircraft. (Similar images captured over the course of the last few weeks had been obscured by cloud cover, making it difficult to discern more recent ground activity.) Rumors of the U.S. arrival at Rmeilan originally surfaced in early January; the images confirm that at least some of those rumors are true....
