sentences:  The crew is increased to 148, and it was offered to the U.S. Navy as a replacement for the Littoral Combat Ship; the FY13 cost of an LCS was $446.3m compared to $735m for an NSC.Patrol Frigate 4921 is a more radical redesign with a crew of 141, adding weapons and sensors at the expense of reducing range from to .It adds a 12-cell Mk56 VLS launcher for ESSM air-defense missiles, just behind the main gun which is upgraded from 57mm to a 76 mm Super Rapid.