"I s the maneuver progressing as you wish. Dr. Bird?" asked the Chief of the Air Corps. The famous scientist lowered his binoculars and smiled. "Exactly, General," he replied. "They are keeping a splendid line." "It is the greatest concentration of air force that this country has ever seen," said General Merton proudly. With a nod, Dr. Bird raised his glasses to his eyes and resumed his steady gaze. Five thousand feet below and two miles ahead of the huge transport plane which flew the flag of t