Lieutenant Colonel Martin sat back in his hard desk chair and looked out through the tinted window to where the slim, dartlike jets waited, poised on the sun-washed runways. A red and blue jet swooped down out of the brilliant, cloudless sky and shot along the runway, wheeled and rolled back toward the parking strip. It was the courier ship from Washington. The colonel frowned, his sunburned face breaking into sharp, diagonal lines. The courier plane was used only in cases requiring utmost secre