A U.S. Patriot missile system is seen at a Turkish military base in Gaziantep in this February 5, 2013 file photo.The United States signed an agreement with Qatar on July 14, 2014 to sell the Gulf Arab ally Apache attack helicopters and Patriot and Javelin air-defense systems valued at $11 billion. REUTERS/Osman Orsal/Files (TURKEY – Tags: MILITARY)