A United States Naval Ship (USNS) is a vessel operated by the United States Navy that is primarily used for support and logistics. Unlike combat ships, USNS vessels are often civilian-crewed and serve various roles, including transporting supplies, equipment, and personnel. They play a crucial part in maintaining the operational readiness of the Navy. USNS ships are part of the Military Sealift Command, which manages the logistics and transportation needs of the Navy. These ships can include oilers, cargo ships, and hospital ships, ensuring that naval forces have the necessary resources to conduct missions effectively.