Note: Since the breakup of the former Soviet Union, the U.S. military has gone through a major downsizing. The effects on U.S. commands is still under way. However, the Navy is still fielding a number of aircraft carriers, and continues to modernize as the U.S. policy makers realize the force projection of the carrier battle group still remains an important element of U.S. foreign policy and military readiness. For more information, see the U.S. Navy strategy and positioning report, which begins with the MILNET document U.S. Navy Strategy and includes a mirror of the official U.S. Navy strategy documents. Also, the U.S. Navy forces arrayed in the Persian Gulf in February of 1998 demonstrate how well this force projection can place war fighting capability as needed into an area of conflict.
Also you may want to glance at the description of naval warships to get a better picture of what a modern navy could use to control the seas or project force onto land.
