Historical darkness

I wanna know what pedophile named it Little Boy

Not Oppenheimer irl. He was a civilian scientist

Ok

Possibly https://ahf.nuclearmuseum.org/ahf/profile/leslie-r-groves/#:~:text=Lieutenant%20General%20Leslie%20Groves%20(1896,director%20of%20the%20Manhattan%20Project.

Lt Col Lesley Groves

Or maybe Truman or the Joint Chiefs of Staff (or head of US Army Air Force.