History of the United States Coast Guard

The history of the United States Coast Guard goes back to the United States Revenue Cutter Service, which was founded on 4 August 1790 as part of the Department of the Treasury. The Revenue Cutter Service and the United States Life-Saving Service were merged to become the Coast Guard per 14 U.S.C. § 101 which states: "The Coast Guard as established January 28, 1915, shall be a military service and a branch of the armed forces of the United States at all times." In 1939 the United States Lighthouse Service was merged into the Coast Guard.

Source: Wikipedia — History of the United States Coast Guard (CC BY-SA 4.0)