Every major city in Georgia had a military installation of some sort. The world's largest infantry training school in the world was at Fort Benning in Columbus. The US Navy trained its 2,000 pilots in the University of Georgia in Athens, and hundreds of thousands of enlisted men made their way to Hunter Field and Camp Gordon. Up to 13,000 civilians were employed in Robin's Field. Defense contractors moved to Georgia and provided jobs to civilians and helped the state in its economic recovery. As many as 28,000 workers were hired to build B-29 bombers by Marietta's Bell Aircraft plant.