History of Wendover Army Air Field, Utah
Taken from the Utah History Encyclopedia (Links Added)

The 393rd Bombardment Squadron (B-29) moved to Wendover in September and the 509th Composite Group was activated in December with a strength of l,767 officers and men, including the First Technical Detachment, a team of civilian and military scientists.

A special ordinance Test Unit assembled inert bombs or "shapes" which were dropped by B-29s to furnish information on ballistics, electrical fusing and detonators, release mechanisms, and flying characteristics of the aircraft. Pits were constructed with hydraulic lifts to hoist the huge bombs into the bomb bay and between October 194 and August 1945, 155 test units were dropped. "Fat Man" tests were performed at Salton Sea Naval Air Station Range, California, and the "Little Boy" was tested on Wendover Range. A high explosive (HE) filled "Fat Man" was tested at Wendover on 4 August 1945 completing the tests.

In January 1945 the 393 left for Cuba, where they flew simulated combat, high altitude, overwater radar bombing and navigation missions. They returned to Wendover and in May received new B-29s which featured lighter engines with fuel injection, reversible electric propellers, pneumatic bomb doors, and a modified tunnel to hold the atomic weapon.

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