From the exploits of Commodore John Paul Jones in the American Revolution to its current service in the Persian Gulf, the U.S. Navy has defended freedom across the worlds oceans and seas. Today, the men and women of the Navy must adapt to diverse challenges, whether it is a military operation or a humanitarian mission. Taylor Baldwin Kiland describes the opportunities the Navy offers, as well as its history, current missions, and the mighty ships that protect America and its allies.