<P> Responsibility for the timing of the second bombing was delegated to Tibbets . Scheduled for August 11 against Kokura , the raid was moved earlier by two days to avoid a five - day period of bad weather forecast to begin on August 10 . Three bomb pre-assemblies had been transported to Tinian , labeled F - 31 , F - 32 , and F - 33 on their exteriors . On August 8 , a dress rehearsal was conducted off Tinian by Sweeney using Bockscar as the drop airplane . Assembly F - 33 was expended testing the components and F - 31 was designated for the August 9 mission . </P>
<P> Responsibility for the timing of the second bombing was delegated to Tibbets . Scheduled for August 11 against Kokura , the raid was moved earlier by two days to avoid a five - day period of bad weather forecast to begin on August 10 . Three bomb pre-assemblies had been transported to Tinian , labeled F - 31 , F - 32 , and F - 33 on their exteriors . On August 8 , a dress rehearsal was conducted off Tinian by Sweeney using Bockscar as the drop airplane . Assembly F - 33 was expended testing the components and F - 31 was designated for the August 9 mission . </P>
original choice for the second nuclear bomb dropped on 9th august 1945
original choice for the second nuclear bomb dropped on 9th august 1945
Kokura
Kokura