The United States Coast Guard (abbreviated USCG stylised as U.S.C.G.) is a military service of the United States. In peacetime, it is under the Department of Homeland Security, but in war, it is moved to the Department of the Navy. It mainly serves as coastal patrol for the United States, and also does anti-drug enforcement and search and rescue.
The original article can be found at United States Coast Guard and the edit history here.