United States Merchant Marine

The United States Merchant Marine refers collectively to U.S.-flagged commercial vessels, both privately and federally owned, and the civilian mariners who crew them. Both the civilian mariners and the merchant vessels are managed by a combination of the government and private sectors, and engage in commerce or transportation of goods and services in and out of the navigable waters of the United States.

Source: Wikipedia — United States Merchant Marine (CC BY-SA 4.0)