In Bockscar, there was no elaborate process to arm Fat Man, as there had been with Little Boy on the previous mission. The plutonium implosion lensing system was so complex that it had to be set up prior to the bomb’s being loaded onto the plane. Therefore, Captain Frederick L. Ashworth of the navy, the mission’s chief weaponeer, only had to climb into the Bockscar’s bomb bay, remove the green safety plugs, and insert the red live plugs. Now the weapon was armed.
