America's youth builds and flies model planes on miniature flying fields. This young American aviation enthusiast, Orin Anderson, poses behind his giant model plane at Kelly Field in the city of San Antonio in the southwestern U.S. state of Texas where members of the Gas Model Club do their weekly flying. Model building has long been a major hobby of American youth, who in 1941 answered a request from the U.S. government to turn out 800,000 scale model airplanes for use by the U.S. Navy, the U.S. Army, and civilian defense groups to train military and civilian personnel to recognize hostile and friendly aircraft. Boys who had learned the principles of model building in home and school workshops turned out scale models of fighters, scouts, fighter bombers, bombers, torpedo carriers, and commercial planes of the United Nations and of the enemy