The first Trump-class vessel, BBGN-1, would cost $23.4 billion, with the 14 that follow averaging $18 billion each. CBO added a cost growth factor reflecting shipbuilding’s tendency to outpace general inflation, averaging 16 percent over the program. The Navy awarded sole-source design work to Leidos Gibbs & Cox for surface ship design engineering and to Bath and Ingalls for ship design support. That would give it more firepower than anything in the fleet outside the 14 Ohio-class ballistic missile submarines, CBO said. Lead ship BBGN-1 would be named Defiant.