NATIONAL HARBOR, MD -- Chief of Naval Operations Adm. Michael Gilday today provided clarification on the delivery schedule for the Columbia-class submarine program, saying the lead boat is approximately 10% behind the Navy's accelerated 78-month delivery schedule, lagging by roughly 7.6 months. Navy Secretary Carlos Del Toro initially told lawmakers the program was 10% behind schedule last week during a House Appropriations defense subcommittee hearing -- the first public indication that the program is losing ground on a tight delivery...