Check the listing for details. WWI 94th Aero Squadron “Hat in the Ring” PVC Patch, Hook & Loop. Listed at 19.95 USD. The squadron's famous insignia—Uncle Sam's hat thrown into the ring —symbolized the United States' entry into the war. Built in durable molded PVC and finished withhook-and-loop backing, this patch honors the aviators who defined U.S. air combat inWorld War I.