In August of 1946, General Leslie Groves, Chief of the Manhattan Project, ordered 60 young officers to Sandia, New Mexico. In a project so wrapped in secrecy that few know of it even a half-century later, Groves charged them to learn how to assemble the early and highly complex atomic bombs. With that goal accomplished, they established a school to train additional assembly teams and the weaponeers and bomb commanders needed for the services' atomic-capable aircraft. Although the wartime atomic scientists believed such tasks lay beyond the ken of military personnel, the Sandia Pioneers...