Raytheon Missile Systems, Tucson, Arizona, is being awarded a $21,235,744 modification to a previously awarded indefinite-delivery/indefinite-quantity contract (N00019-11-D-0004) to provide AIM-9X Sidewinder mission support and sustainment activities for the U.S. Air Force, U.S. Navy, and the governments of Singapore, Australia, Denmark, Finland, Turkey, South Korea, Switzerland, Saudi Arabia, and Poland. Work will be performed in Tucson, Arizona, and is expected to be completed in August 2015. Funds are not being obligated at time of award; funds will be obligated on individual delivery orders as they are issued. This contract combines purchases for the U.S. Air Force ($8,511,899; 40.08 percent); U.S. Navy ($8,501,000; 40.03 percent); and the governments of Singapore ($469,205; 2.21 percent); Australia ($469,205; 2.21 percent); Denmark ($469,205; 2.21 percent); Finland ($469,205; 2.21 percent); Turkey ($469,205; 2.21 percent); South Korea ($469,205; 2.21 percent); Switzerland ($469,205; 2.21 percent); Saudi Arabia ($469,205; 2.21 percent); and Poland ($469,205; 2.21 percent) under the Foreign Military Sales Program. The Naval Air Systems Command, Patuxent River, Maryland, is the contracting activity.