The 2002 Commemorative 'HEROES USA' 9/11 USPS First Day of Issue cover pays tribute to the heroes of the September 11th attacks and the firefighters of the New York City Fire Department. This event cover was issued in the United States and features a First Day of Issue cancellation, making it a valuable collectible for those interested in historical events and American patriotism. The cover showcases a piece of United States history and serves as a commemorative piece for collectors of US event stamp covers.