The continued presence of U.S. troops in Saudi Arabia was one of the stated motivations behind the September 11 attacks , as well as the Khobar Towers bombing . In 2003 , the U.S. withdrew most of its troops from Saudi Arabia , though one unit still remains . On October 20 , 2010 , U.S. State Department notified Congress of its intention to make the biggest arms sale in American history – an estimated $ 60.5 billion purchase by the Kingdom of Saudi Arabia . The package represents a considerable improvement in the offensive capability of the Saudi armed forces
September 11 attacks
September 11 attacks
Saudi Arabia–United States relations