United States Air Force. Condition: Used, but in nice shape. Enamel is hard baked. The coin is 1 3/4 inches in diameter with hard baked enamel. Jumper (born February 4, 1945) is a retired United States Air Force. Who served as 17th Chief of Staff of the United States Air Force. From September 6, 2001 to September 2, 2005. He retired from the Air Force on November 1, 2005. Jumper was succeeded as Chief of Staff by General T. To view miscellaneous challenge coins. NOTE: Never personally given any of the coins. All coins are guaranteed to be in excellent condition unless specified above. The free listing tool. The item “General John P. Jumper United States Air Force Chief of Staff Challenge Coin” is in sale since Wednesday, July 09, 2014. This item is in the category “Collectibles\Militaria\Current Militaria (2001-Now)\Original Items\Challenge Coins”. The seller is “rolyat11″ and is located in Panama City, Florida. This item can be shipped worldwide.