Title: Code name
Content:  Britain and the United States developed the security policy of assigning code names intended to give no such clues to the uninitiated. For example, the British counter measures against the V-2 was called Operation Crossbow. The atomic bomb project centered in New Mexico was called the Manhattan Project, derived from the Manhattan Engineer District which managed the program. The code name for the American A-12 / SR-71 spy plane project, producing the fastest, highest-flying aircraft in the world, was Oxcart. The American group that planned that country's first ICBM was called the Teapot Committee. Although the word could stand for a menace to shipping (in this case, that of Japan), the American code name for the attack on the subtropical island of Okinawa in World War II was Operation Iceberg. The Soviet Union's project to base missiles in Cuba was named Operation Anadyr after their closest bomber base to the US (just across the Bering Strait from Nome, Alaska). The names of colors are generally avoided in American practice to avoid confusion with meteorological reporting practices. Britain, in contrast, made deliberately non-meaningful use of them, through the system of rainbow codes.
Title: Code name
Content:  technology & technique) ; Smiling Buddha – (Pokhran-I), was an assigned codename of India's first nuclear weapon explosion, which took place on 18 May 1974. The device was detonated by the Indian Army in the long-constructed army base, Pokhran Test Range. It was also the first confirmed nuclear test by a nation outside the five permanent members of the United Nations Security Council. ; Project-706 (with Chagai-I and Chagai-II) – an early Pakistani secret code name for its nuclear weapons programme during the Cold War ; Tank – originally a code name adopted in 1915 by the British government for the first tracked armoured vehicles, which were then under development ; Tube Alloys – British nuclear program 
Title: Soviet atomic bomb project
Content:  The Soviet atomic bomb project (Russian: Советский проект атомной бомбы, Sovetskiy proyekt atomnoy bomby) was the classified research and development program that was authorized by Joseph Stalin in the Soviet Union to develop nuclear weapons during World War II. Although the Soviet scientific community discussed the possibility of an atomic bomb throughout the 1930s, going as far as making a concrete proposal to develop such a weapon in 1940,   the full-scale program was not initiated until World War II. Because of the conspicuous silence of the scientific publications on the subject of nuclear fission by German, American, and British scientists, Russian physicist Georgy Flyorov suspected that the Allied powers had secretly been developing a "superweapon" since 1939. Flyorov wrote a letter to Stalin urging him 
Title: J. Robert Oppenheimer
Content:  bomb were well known. In 1951, Edward Teller and mathematician Stanislaw Ulam developed what became known as the Teller-Ulam design for a hydrogen bomb. This new design seemed technically feasible and Oppenheimer officially acceded to the weapon's development, while still looking for ways in which its testing or deployment or use could be questioned. As he later recalled: "The program we had in 1949 was a tortured thing that you could well argue did not make a great deal of technical sense. It was therefore possible to argue also that you did not want it even if you could have it. The program 
Title: Robert Serber
Content:  wife Charlotte Serber was appointed by Oppenheimer to head the technical library at Los Alamos, where she was the only wartime female section leader. Serber created the code-names for all three design projects, the "Little Boy" (uranium gun), "Thin Man" (plutonium gun), and "Fat Man" (plutonium implosion), according to his reminiscences (1998). The names were based on their design shapes; the "Thin Man" would be a very long device, and the name came from the Dashiell Hammett detective novel and series of movies of the same name; the "Fat Man" bomb would be round and fat and was named after Sydney Greenstreet's character in The Maltese Falcon (from Hammett's novel). "Little Boy" would come last and be named only to contrast to the 
Title: Atomic bombings of Hiroshima and Nagasaki
Content:  with the Manhattan Project, under the direction of Major General Leslie R. Groves, Jr., of the U.S. Army Corps of Engineers. Groves appointed J. Robert Oppenheimer to organize and head the project's Los Alamos Laboratory in New Mexico, where bomb design work was carried out. Two types of bombs were eventually developed, both named by Robert Serber. Little Boy was a gun-type fission weapon that used uranium-235, a rare isotope of uranium separated at the Clinton Engineer Works at Oak Ridge, Tennessee. The other, known as a Fat Man device, was a more powerful and efficient, but more complicated, implosion-type nuclear weapon that used plutonium created in nuclear reactors at Hanford, Washington. There was a Japanese nuclear weapon program, but it lacked the human, mineral and financial resources of the Manhattan Project, and never made much progress towards developing an atomic bomb.
Title: Military history of the Soviet Union
Content:  The Soviet Union tested their first atomic bomb codenamed "First Lightning" on 29 August 1949, four years after the atomic bombings of Hiroshima and Nagasaki, surprising many Western commentators who had expected the U.S. monopoly to last for some time longer. It soon came out that the Soviet atomic bomb project had received a considerable amount of espionage information about the wartime Manhattan Project, and that its first bomb was largely a purposeful copy of the U.S. "Fat Man" model. More important from the perspective of the speed of the Soviet program, the Soviets had developed more uranium reserves than specialists in the American 
Title: Nuclear arms race
Content:  bombs the United States had dropped on Japan in 1945. Both governments spent massive amounts to increase the quality and quantity of their nuclear arsenals. Both nations quickly began the development of thermonuclear weapons, which can achieve vastly greater explosive yields. The United States detonated the first hydrogen bomb on November 1, 1952, on Enewetak, an atoll in the Pacific Ocean. Code-named "Ivy Mike", the project was led by Edward Teller, a Hungarian-American nuclear physicist. It created a cloud 100 mi wide and 25 mi high, killing all life on the surrounding islands. Again, the Soviets surprised the world by exploding a deployable thermonuclear device in 
Title: Atomic spies
Content:  as a nuclear bomb, and nuclear power were deemed too great to pursue. At the urging of Albert Einstein and Leo Szilard in their letter of August 2, 1939, the United States — in collaboration with Britain and Canada — recognized the potential significance of an atomic bomb. They embarked in 1942 upon work to achieve a usable device. Estimates suggest that during the quest to create the atomic bomb, an investment of $2 billion, temporary use of 13,000 tons of silver, and 24,000 skilled workers drove the research and development phase of the project. Those skilled workers included the people to maintain and 
Title: Collaboration
Content:  The Manhattan Project was a collaborative project during World War II among the Allies that developed the first atomic bomb. It was a collaborative effort by the United States, the United Kingdom and Canada. The value of this project as an influence on organized collaboration is attributed to Vannevar Bush. In early 1940, Bush lobbied for the creation of the National Defense Research Committee. Frustrated by previous bureaucratic failures in implementing technology in World War I, Bush sought to organize the scientific power of the United States for greater success. The project succeeded in developing and detonating three nuclear weapons in 1945: a test detonation of a plutonium implosion bomb on July 16 (the Trinity test) near Alamogordo, New Mexico; an enriched uranium bomb code-named "Little Boy" on August 6 over Hiroshima, Japan; and a second plutonium bomb, code-named "Fat Man" on August 9 over Nagasaki, Japan.

Question: what was the code name of the us program to develop an atomic bomb?
Answer: Manhattan.
Development of Substitute Materials.
The Manhattan Project.