Coast Guard one of five US armed service branches. The Coast Guard's mission is primarily with domestic waterways. The Coast Guard does rescues, law enforcement, drug prevention, and clears waterways.
Currently, the Coast Guard operates under the Department of Homeland Security during peacetime and under the Navy during wartime, or by special presidential order. In addition to protecting our nation's waterways, the active-duty members of the Coast Guard perform search and rescue, law enforcement and environmental cleanup operations.