After several years of planning and discussions, the Defense Department notified Congress today that it would pursue a two-ship buy of the third and fourth Gerald Ford-class aircraft carriers, a move that will save an estimated $4 billion, a congressman overseeing Navy shipbuilding told Inside Defense . That is $1.5 billion more than what Navy officials previously projected the service could save by purchasing the Enterprise (CVN-80) and the unnamed CVN-81 in a dual-buy format. House Armed Services seapower and...