US Air Force Colonel Tonja M. Brickhouse Challenge CoinMeasures Approximately: 1.50 InchesNo Special EdgingFront: Service, Integrity, Excellence, Colonel Tonja M. Brickhouse, 1 February 2005Back: United States Air Force, Colonel Tonja M. BrickhouseChallenge Coins are generally created for the Military and are prized by the service members that receive them. Perfect for Collectors of Militaria.