At the three-power Bermuda Conference in December 1953, Eisenhower and Churchill, who had become prime minister again on 25 October 1951, discussed the possibility of the United States giving Britain access to American nuclear weapons in wartime, which came to be called Project E. There were technical and legal issues that had to be overcome before American bombs could be carried in British aircraft. The Americana would have to disclose their weights and dimensions, and their delivery would require data concerning their ballistics. Further down the track would also be issues of custody, security and targeting. The release of such information was restricted by the McMahon Act.