HAROLD, my husband was in the Pacific on an aircraft carrier and, although he never talked about the war, he did say once that everyone was so relieved when the bombs were dropped to end the war as they were preparing (the fleet) to invade Japan by air, sea and land.
JOANP, two scientists that I have read about that worked in Los Alamos (the lab) - Oppenheimer and General Groves (although I think he was to oversea the project) - interesting to read. Oppenheimer was accused of being a Communist - well, here is the short history.
"During the beginning of World War II, news arrived in the U.S. that the Nazis were progressing towards the creation of an atomic bomb. Though they were already behind, the U.S. believed they could not allow the Nazis to build such a powerful weapon first. In June 1942, Oppenheimer was appointed the director of the Manhattan Project, the U.S.'s team of scientists who would work to create an atomic bomb.
Oppenheimer threw himself into the project and proved himself not only a brilliant scientist, but also an exceptional administrator. He brought the best scientists in the country together at the research facility at Los Alamos, New Mexico. After three years of research, problem solving, and original ideas, the first small atomic device was exploded on July 16, 1945 in the lab at Los Alamos. Having proved their concept worked, a larger scale bomb was built. Less than a month later, atomic bombs were dropped on Hiroshima and Nagasaki in Japan.
The massive destruction the bombs inflicted troubled Oppenheimer. He had been so caught up in the challenge of creating something new and the competition between the U.S. and Germany that he - and many of the other scientists working on the project - had not considered the human toll that would be caused by these bombs. After the end of World War II, Oppenheimer began to voice his opposition to creating more atomic bombs and specifically opposed developing a more powerful bomb using hydrogen (the hydrogen bomb).
Unfortunately, his opposition to the development of these bombs caused the United States Atomic Energy Commission to examine his loyalty and questioned his ties to the Communist Party in the 1930s. The Commission decided to revoke Oppenheimer's security clearance in 1954". - About.com
As I remember, he was brought up by the Senate for a hearing, but perhaps I'm wrong. I just felt very sorry for him, it ruined his life.