The Great Lakes Naval Station had one of the best ballclubs during World War II, when many major league players joined the service. Because the military was still segregated, there was a separate black Great Lakes club, on which future pioneer Larry Doby played. These ball caps are limited in production. If you are interested in one of these repro caps, it is best to order while available. All Ebbets Field Flannels authentic ball caps are made in the USA.