I spoted this while out flying May 30th while practicing some maneuvers in the practice area.  Thanks to Eddie for looking it up and finding out that it is an X-Craft / Littoral Surface Craft-Experimental (LSC(X))
Fast Sea Frame / Sea Fighter (FSF 1).  More information on this ship can be found here.  http://www.globalsecurity.org/military/systems/ship/x-craft.htm