General Dynamics Electric Boat is seeing throughput improvements within the Columbia- and Virginia-class submarine programs but still needs additional aid from the Navy to stabilize the submarine supply chain, company executives said today. “At Electric Boat we increased our velocity and throughput on Virginia by about 10% this year . . . and about 30% on Columbia,” General Dynamics CEO Phebe Novakovic told Wall Street analysts during a fourth-quarter earnings call. “So, Electric Boat is continuing to do well; they...