The Navy’s ship for future sea warfare has become so problematic a congressional subcommittee has called a public hearing to get immediate answers. The Seapower and Expeditionary Forces Subcommittee will hear from those responsible for the Littoral Combat Ship program. In recent weeks, the program to build a fast, flexible and lightly manned warship has been beset with issues. Its advertised price of $220 million per hull rose dramatically to estimates toward $400 million a piece. The Navy wants 55 of the frigate-sized, shallow draft ships, making it a cornerstone of the future fleet. It’s designed to operate close to shore with a ship’s crew of just 40 sailors and a mission crew and air detachment of 35.