The Navy is weighing maintenance options for some Ohio-class submarines to ensure a smooth transition to the Columbia-class submarine, a top Navy submariner said Thursday. Rear Adm. Scott Pappano, the Navy’s program executive officer for strategic submarines, said Thursday at the Naval Submarine League Annual Symposium that the Navy needs to take proactive action to maintain strategic deterrence during the transition between the two classes of submarines. “It gets very difficult in those years,” he said. “Right now, I am...