What branch of service is known as revenue marine?

The term "Revenue Marine" historically refers to the U.S. Coast Guard, particularly during its early years when it was primarily tasked with enforcing customs laws and collecting tariffs. Established in 1790, the Revenue Cutter Service was the precursor to the Coast Guard, which now serves a broader range of functions, including search and rescue, maritime law enforcement, and environmental protection. Today, the U.S. Coast Guard is a vital branch of the armed services, operating under the Department of Homeland Security during peacetime and can be transferred to the Department of the Navy during wartime.