More than forty years ago, on 17 June 1942, President Roosevelt received a report from Vannevar Bush describing the possibilities of producing a nuclear weapon that could be employed decisively in combat. Under any of four possible methods, Bush told the President, such a weapon might be produced in time to influence the outcome of the ongoing war. The next day, President Roosevelt approved Bush's report and the Army Engineer Corps was directed to create a new unit that has become familiar in history as the Manhattan Project.
Wolfowitz, Paul D.
"Preserving Nuclear Peace,"
Naval War College Review: Vol. 36
, Article 7.
Available at: http://digital-commons.usnwc.edu/nwc-review/vol36/iss2/7