The classifications for United States Navy ships are as follows:
Aircraft Carrier – Ships that provide ocean airbases in order to conduct combat operations by on board aircraft (planes and helicopters).
Surface Combatant – Heavily armed ships which designed to engage enemy forces in any of the world’s oceans. This category includes battleships, battlecruisers, cruisers, destroyers and frigates.
Submarine – Underwater vehicles that provide military support and/or attack arsenals against the enemy. Navy submarines can be categorized as attack, nuclear, auxiliary, research and development or nuclear. In the year 2000 , it was the 100th anniversary of the U.S. Navy’s submarine force.
Patrol Combatant – Ships that provide sea keeping missions, with a capability of operations exceeding 48 hours or more without support.
Amphibious warfare – ships that can operate on both on the land and sea.
Support – ships designed to provide general support to the other ships in the high seas.
· Helicopter carrier
· Pocket battleship
· Patrol boat
· Fast attack craft