The Navy is evaluating how unmanned vessels will factor into the fleet and expects to issue a new requirement for such ships, according to a senior service official. During a House Armed Services seapower subcommittee hearing last week, Rep. Seth Moulton (D-MA) pressed Deputy Chief of Naval Operations for Warfare Systems Vice Adm. William Merz as to why unmanned surface vehicles and unmanned undersea vehicles are not part of the Navy’s force-structure assessment, which accounts for battle-force ships. Merz said...