Eyes of the North. Iceland Air Defense Systems. Guardians of the North. Naval Air Station Keflavik. Land of Fire and Ice. In God We Trust. All Other We Intercept. Air Force / Navy Challenge Coin. Condition: Used, and in nice shape. The coin is 1 3/4 inches in diameter. Never personally given any of the coins. All coins are guaranteed to be in excellent condition. The free listing tool.