Sikorsky Aircraft Corp., Stratford, Conn., is being awarded a $41,476,433 modification to a previously awarded indefinite-delivery/indefinite-quantity contract (N00019-07-D-0004) to exercise an option for security, project engineering, integrated logistics support, VH trainingand technical manual updates in support of VH Presidential Helicopter including special progressive aircraft rework of three VH-3D aircraft.  Funds will be obligated on individual delivery orders as they are issued.  Work will be performed in Stratford, Conn. (88 percent), and Quantico, Va., (12 percent) and is expected to be completed in September 2013.  Contract funds will not expire at the end of the current fiscal year.  The Naval Air Systems Command, Patuxent River, Md. is the contracting activity.