Not Jayhawk specicifc, but general USCG markings can be purchased from
Coast Guard Models . They sell a 8.5 x 11" mylar sheet of USCG emblems; emblems range in size from 1/2 inch to 2 &7/8 inch. 36 emblems on a sheet: 6 each of 1/2", 5/8", 13/16" 15/16" and 1 & 1/4"; 2 each of 2", 2 & 1/4" and 2 & 7/8". He also has pressure sensitive "U.S. COAST GUARD" lettering in black or white in the following standard sizes: 1/4" high x 3.5" long; 3/8" x 6"; 1/2" x 7"; 5/8" x 9.5"; 3/4" x 11"; and 1" x 15". Other sizes are available on request as a special order. The U.S. COAST GUARD lettering is made up in a set of two readings, total of 24 letters and 4 period marks. The catalog I have is from 2002, and prices for the CG logos are $12.00 and the lettering starts at $18.70 for the 1/4" size up to $21.70 for the 1" size.