A Look at Military Sealift Command.

Military Sealift Command has a fleet of more than 130 ships and employs more than 7,000 civil service mariners who safely operate, supply, and maintain them. They provide logistics support, conduct special missions, move military equipment, supply combat forces, provide humanitarian relief, and strategically position combat cargo around the world.
MSC supports the joint warfighter across the full spectrum of military operations delivering agile logistics, strategic sealift, as well as specialized missions anywhere in the world, under any conditions, 24/7, 365 days a year.