When was the United States Coast Guard established as a separate military service?

The United States Coast Guard was established as a separate military service on August 4, 1915. This marked the official formation of the Coast Guard through the merger of the Revenue Cutter Service and the Lifesaving Service. The inception of the Coast Guard as a distinct branch of the military enabled it to operate under the Department of Homeland Security during peacetime and under the Department of the Navy during wartime. This distinction solidified the Coast Guard's role and identity among the five branches of the U.S. military. The establishment in 1915 was significant as it formalized the Coast Guard's authority and functions, expanding its responsibilities in maritime safety, security, environmental protection, and law enforcement.