President-elect Donald Trump's goal of a 350-ship Navy will cost the U.S. taxpayer "several billion dollars" above the previously estimated $21 billion per year to have 308 ships in the inventory, according to a congressional source. The cost estimate is based on a 30-year shipbuilding plan. The Congressional Budget Office, in its fiscal year 2016 shipbuilding report, projected a 308-ship Navy to cost $21 billion per year, which is $5 billion more than what the Navy budgeted for FY-16. CBO's...