From the Summary: "The United Arab Emirates (UAE) has been a significant U.S. partner in Gulf security, helping to address multiple regional threats by hosting U.S. military personnel at UAE military facilities and buying sophisticated U.S. military equipment, including missile defenses and combat aircraft. The alliance with the United States is expected to continue after UAE President Shaykh Khalifa bin Zayid Al Nuhayyan, who suffered an incapacitating stroke in January 2014, is succeeded by his younger brother and de-facto UAE leader Shaykh Muhammad bin Zayid Al Nuhayyan. With ample financial resources and a U.S. armed and advised military, the UAE has increasingly asserted itself in the region."
CRS Report for Congress, RS21852
Congressional Research Service: https://crsreports.congress.gov/