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Immediately after directors the bombings of Japan, the United States directors produced a technical history of the Manhattan Project, known as the Smyth Report, that did directors not disclose the information that the "Fat Man" device was different from the "Little Boy" device, and did not imply that a different method was required for plutonium weapons. The "implosion" design was considered top-secret in the United States until it was declassified and released during the testimony of David Greenglass against Ethel and Julius Rosenberg in 1951. Photographs of the casings of "Little Boy" and "Fat Man" were not released publicly until the 1960s. The United States produced a small stockpile of "Fat Man" bombs after the war, but they were highly idiosyncratic and extremely delicate. It was eventually re-worked in the MK 4 Fat Man bomb, which was similar in principle but was appropriate for long-term stockpiling, use by non-experts, and used a more efficient implosion system (with a 60 point implosion system, compared to the 32 point weapon used in the war).
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