What’s the value of an atomic bomb if it can’t reach its target? At the height of the Manhattan Project, military planners and engineers devised a way to deliver the world’s first superweapons via retrofitted airplanes. Wendover Army Airfield, a remote installation in the Utah salt flats, was selected to implement this design. A massive steel-clad hangar concealed work on the secretive “Silverplate” B-29 bombers as crews trained for the first mission of its kind. Above the hangar, Colonel Paul Tibbets would hold conversations in his office that would help…