Few are aware that the Coast Guard was originally formed by combining five other federal services. Made up of the U.S. Lighthouse Service, the Revenue Cutter Service, the Steamboat Inspection Service, the Bureau of Navigation and the U.S. Lifesaving Service, the Coast Guard was formed. This congressional act created the formation of the Coast Guard in 1915 and was placed under the supervision of the Department of Treasury and then transferred to the Department of Transportation by an executive order.
Today, the Coast Guard falls under the Department of Homeland Security during times of peace and the Navy in times of war. The Coast Guard is responsible for search and rescues, drugs, immigrant trafficking, and acts as the law enforcement of coastal waters.