The UAE has been a significant U.S. partner in Gulf security for more than two decades, and the alliance is extending to the U.S.-led effort against the Islamic State organization. A 1994 U.S.-UAE defense cooperation agreement (DCA) provides for U.S. military use of several UAE facilities, and about 5,000 U.S. military personnel are in the UAE at those facilities. The UAE was the first Gulf state to order the most sophisticated missile defense system...