MEMPHIS, Tenn. - A Maritime Safety and Security Team small boat crew patrols the Mississippi River, 2005. MSSTs were created by the Maritime Transportation Security Act of 2002 (MTSA) in direct response to the terrorist attacks on Sept. 11, 2001, and are a part of the United States Department of Homeland Security's layered strategy directed at protecting seaports and waterways. U.S. Coast Guard photo.