US COAST GUARD MARITIME LAW ENFORCEMENT Challenge Coin. This is a great looking US COAST GUARD MARITIME LAW ENFORCEMENT challenge coin. Coin has reeded edges and is about 1 9/16" in diameter. All details are raised lettering and gold plated. Coin is contained in an acrylic air tight holder. Protecting America?s Ports, Waterways, and Interests at home and abroad is the job of the Department of Homeland Security?s United States Coast Guard. Maritime Enforcement Specialists are trained in Maritime Law Enforcement, Anti-terrorism, Force Protection, and Physical Security. Maritime Enforcement Specialists are professionals well grounded in knowledge and skills pertaining to law enforcement and security duties. As such, members of this rating can be expected to be assigned challenging duties including traditional maritime law enforcement, anti-terrorism force protection, port security and safety, as well as providing unit-level training in these fields.