Sikorsky Aircraft Corp., Stratford, Conn., was awarded a $563,788,721 firm-fixed-price contract.  The award will provide for the modification of an existing contract to fund the Navy’s Second Program Year in support of MH-60S and MH-60R Helicopters.  Work will be performed in Stratford, with an estimated completion date of Sept. 30, 2016.  One bid was solicited, with one bid received.  The U.S. Army Contracting Command, Redstone Arsenal, Ala., is the contracting activity (W58RGZ-12-C-0008).