Check the listing for details. Combined Forces Command Challenge Coin USFK from CIC Gen Gary E. Luck 4-Star. Condition: Used. Listed at 175.00 USD. This is a dog tag style challenge coin presented by a 4-Star Commander in Chief of USFK General Gary E. Luck. Please read more about him below. The coin measures approximately 2.25” x 1.25” and shows light scratches, edge nicks, and discoloration spots. Overall, rare coin from a legendary U.S. Army leader. Please review pictures provided and ask any questions before purchasing **** General Gary Edward Luck (5 August 1937 – 14 August 2024) was a four-star general of the United States Army. Following his retirement, he was a senior advisor to the United States Joint Forces Command prior to that command's inactivation. He was a Senior Fellow for the National Defense University in support of the Pinnacle, Capstone, and Keystone programs.