Naval power … is the natural defense of the United States,” said John Adams, who more than any other man deserves to be called the father of the American Navy. For more than two centuries, this force—from the raggle-taggle Continental Navy to the missile submarines of today—has played a vital role in the defense of the nation’s freedom and independence. Ships and weapons, tactics and strategy, have undergone quantum changes over the years, but the mission of the U.S. Navy remains unchanged: to ensure safe passage for all those who do business upon the great waters.