The latest news and top stories on the US Coast Guard. A prominent Washington D.C. based governmental body, the US Coast Guard is a military service and federal law enforcement agency dedicated to maritime safety security and stewardship. Its primary mission is to protect defend and save lives and property at sea. Key activities include search and rescue, maritime law enforcement, environmental protection, port security and national defence. As the oldest continuous seagoing service in the United States, it plays a vital role in safeguarding the nation's waters and economic interests.