Semper Paratus - Always Ready. That is your Coast Guard motto. The Coast Guard is one of our nations' five military services. We exist to defend and preserve the United States. We protect the personal safety and security of our people; the marine transportation system and infrastructure; our natural and economic resources; and the territorial integrity of our nation–from both internal and external threats, natural and man-made. We protect these interests in U.S. ports and inland waterways, along the coasts, on international waters.