MK-I Little Boy & MK-III Fat Man
They were the names given to bombs. Research the Manhattan project.
The Manhattan Project IS the codename. So no, there is not.
Manhattan Project
The Manhattan Project - the development of the atomic bombs which were dropped on Japan.
Opennheimer
the nuclear bombs
The Manhattan project was controversial because the result was the production of very dangerous nuclear bombs.
Manhattan experiment project produced the first atomic bombs in the course of World War II.
J. Robert Oppenheimer was in charge of the Manhattan Project, which was started by Franklin Delano Roosevelt. The Manhattan Project produced both atomic bombs.
MacArthur knew nothing about the Manhattan Project until after the bombs were dropped.
America was in debt during the Manhattan project. The Manhattan project was led by the United States and produced the first atomic bombs during World War II.
The Manhattan Project began in 1942 and ended in August 1947, with the establishment of the Atomic Energy Commission. A rough estimate is that in this time 15 to 20 atomic bombs had been built, with 5 of those detonated, leaving a stockpile by the time the Manhattan Project ended of 10 to 15 atomic bombs.
The project to build the atomic bomb was given the secret code-name of "The Manhattan Project", however the bombs were not built in Manhattan. Check wikipedia for details on actual locations.
The Manhattan Project, which was a research and development program during World War II, led to the creation of the first atomic bombs. The project was primarily based in the United States and resulted in the successful testing of the atomic bomb in New Mexico in 1945. The bombs developed under the Manhattan Project were later used in the bombings of Hiroshima and Nagasaki, ultimately leading to the end of the war in the Pacific.
MK-I Little Boy & MK-III Fat Man
The scientists did not "give up" on the Manhattan Project. They accomplished their goals of developing three atom bombs. The Project ended at the end of the war. The workers went home and much of the "little towns" were taken down. There was no need for the project to continue after the war. It cost 2 billion dollars back then to create the three bombs so the government would not fund it any further when there was no need for further work.