Up to 17,000 trained at Wendover at its peak, dwarfing what had been a railroad stop on the edge of Utah's West Desert.įewer than 4,000 airmen were training here, though, by the time the unit that would become Wendover's most famous gathered in spring 1945 - the 509th Composite Group with a super-secret mission. Thousands of airmen learned to fly heavy bombers during World War II at Wendover Army Air Base, which was authorized by a Congress anticipating war and became a sprawling base with 668 buildings after the Dec.