When the 78 ships and 133 aircraft home ported there are not at sea, they are alongside one of the 14 piers or inside one of the 15 aircraft hangars for repair, refit, training and to provide the ship's or squadron's crew an opportunity to be with their families. The base is home port to aircraft carriers, cruisers, destroyers, large amphibious ships, submarines, and a variety of supply and logistics ships. Port Services controls more than 3,100 ships' movements annually as they arrive and depart their berths. Port facilities extend more than four miles (6 km) along the waterfront and include some seven miles (11 km) of pier and wharf space.