United States Air Force Commemorative Coin, 1-5/8". Remember and commemorate the men and women past and present of the United States Air Force with this great coin. This challenge coin features the United States of America department of Air Force on one side and the United States Air Force symbol in bold blue and silver on the flip side. Die Struck, this coin is gold plated on one side, nickel plated on the other and hand filled with enamel colors. The sandblasted background and high polished surface makes it a truly beautiful piece. Each coin is packaged in a protective vinyl pouch.