The Universal Ship Cancellation Society (USCS) is an international philatelic non-profit organization with an interest in postmarks and covers from all maritime services. Founded in 1932, the USCS is one of the oldest specialized postal history societies in the world and the only organization in the United States devoted to navy and maritime covers.
As of 2008, the USCS consists of about 1,300 members worldwide. Member’s interests includes topics such as: navy ships of all countries, merchant ships with seapost and paquebot markings, the Marine Corps and the Coast Guard, navy bases, related cachets, postcards, patches, photographs and other navy memorabilia.