A carrier group, also known as a carrier strike group (CSG) or carrier battle group (CVBG), is a naval fleet consisting of an aircraft carrier and its large number of escorts, together defining the group. The carrier strike group is a flexible naval force that can operate in confined waters or in the open ocean, during day and night, in all weather conditions. The principal role of the carrier and its air wing within the carrier strike group is to provide the primary offensive firepower, while the other ships provide defense and support. The typical breakdown for a current carrier strike group includes one aircraft carrier, at least one guided missile cruiser for air defense, two LAMPS-capable warships focusing on anti-submarine and surface warfare, and one or two anti-submarine destroyers or frigates. The carrier strike group is a potent power-projection platform, and its mission is to achieve and sustain air, sea, and undersea control, respond to crises, and protect United States’ interests anywhere, anytime. The United States Navy maintains 11 carrier strike groups, 10 of which are based in the United States and one that is forward deployed in Japan.