The main purpose of an aircraft carrier is to project force. Each full US carrier (the Nimitz-class carriers) can carry something like 100 aircraft. When an aircraft carrier deploys, it takes a Carrier Strike Group (CSG), made up of several other warships and supply vessels. They are always escorted by at least one (sometimes two) attack submarine(s), guided missile cruisers, guided-missile destroyers, frigates and supply support ships.
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