Chuck Yeager loved to fly. His determination led him to be a fighter and test pilot. He flew as often as he could in any craft he could. Eventually, he became the expert on military aircraft. He knew just what each plane could do, and more importantly, what it couldnt. As important as knowing how far he could push a plane, he also knew when to pull back. His pioneering efforts in breaking the sound barrier made modern aviation and space exploration possible.