Sikorsky Aircraft Corp., Stratford, Conn., is being awarded a $20,521,388 modification to a previously awarded indefinite-delivery/indefinite-quantity contract (N00019-07-D-0004) for special progressive aircraft rework of two VH-3D and one VH-60N executive helicopters, including vendor repairables and component overhaul.  Funds will be obligated on individual delivery orders as they are issued.  Work will be performed in Stratford, Conn., and is expected to be completed in September 2012.  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.