sentences:  Recipients of the Bronze, Silver and Gold Medal may wear the corresponding square knot insignia, with a blue, green and white knot on a tan background, on the BSA uniform.The Hornaday Gold Medal for adults serving at least 20 years in conservation has only been awarded about 40 times since its establishment in 1975.Since the original Hornaday medals and badges were established in 1914, slightly more than 1,000 bronze medals and 2,200 youth badges have been awarded.