"The United Arab Emirates (UAE) has been a significant U.S. partner in Gulf security for more than two decades, helping to address multiple regional threats, and benefitting from long-standing and extensive defense cooperation with the United States. About 5,000 U.S. military personnel are stationed at UAE military facilities, hosted there under a 1994 U.S.-UAE defense cooperation agreement (DCA) that remains in effect by mutual agreement. The UAE was the first Gulf state to order the most sophisticated missile defense system sold by the United States (the THAAD), demonstrating support for U.S. efforts to forge a coordinated missile defense network against Iran. The UAE also hosts other Western forces, including those of France."
CRS Report for Congress, RS21852
Federation of American Scientists: http://www.fas.org/sgp/crs/index.html