The United States Coast Guard was established on August 4, 1790. Originally founded as the Revenue-Marine by Alexander Hamilton, the military branch was created to enforce tariff laws and prevent smuggling. “The Coast Guard is ‘The Hard Nucleus About Which the Navy Forms in Time of War.’” — President Franklin D. Roosevelt It wasn’t until 1915 that Revenue-Marine officially became the US Coast Guard. August 4 is now celebrated as the Coast Guard’s official birthday.