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Yes, a third atomic bomb (a MK-III plutonium implosion assembly atomic bomb) kit had been built by Los Alamos during WW2. It had been shipped to San Francisco to be flown across the Pacific to Tinian for assembly and delivery to another Japanese city in late August. (Note: this kit was probably just the plutonium core, the polonium/beryllium initiator neutron source, and the uranium tamper as Tinian already seems to have had a dozen or more MK-III casings and explosive lens assembly kits stockpiled)

However as the Japanese had announced their intent to surrender on August 14 (while this bomb was still in transit), causing Truman to declare the end of the bombing of Japan, when this bomb arrived in San Francisco on August 18 it was immediately shipped back to Los Alamos, becoming the first atomic bomb in the US nuclear stockpile.

Had Japan not surrendered, the US had plans and the industrial capacity to produce and deliver 20 more MK-III type atomic bombs on Japan before the end of 1945:

  1. 3 in September
  2. 3 in October
  3. 7 in November
  4. 7 in December
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10y ago

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