Newly obtained documents reveal that the United States has been training United Arab Emirates troops “for combat operations in Yemen,” Yahoo News reports. The revelation flies in the face of an announcement from the Pentagon last November saying that it was ceasing aerial refueling of Saudi-led coalition aircraft operating in Yemen. The documents also underscore frustrations over the lack of transparency surrounding U.S. military support for a war that has killed thousands of civilians and pushed Yemen to famine. The United States is “not a participant in the civil war in Yemen nor are we supporting one side or the other,” General Joseph F. Dunford, chairman of the Joint Chiefs of Staff said last month, echoing the Pentagon. However, the new documents reportedly show that the U.S. military has been even more deeply involved in the war than previously indicated, despite unambiguous claims to the contrary.