Please check out the other pins on my page. I sell rare law enforcement pins. The Dover AFB 50th Golden Anniversary 1941 – 1991 436th & 512th Military Airlift Wings Challenge Coin is a highlysought-after coin. Made in the United States, this challenge coin commemorates the 50th anniversary of the two military airlift wings at Dover Air Force Base. A unique and Military-themed piece for collectors or veterans interested in honoring the history and significance of these military units. I believe it’s real Silver.