Novenber 1, 1958-September 1961 United States, Great Britain, and Soviet Union abide by moratorium on atmospheric nuclear weapon testing as negotiations continued for a definitive agreement. May 5-8, 1959 Joint Committee on Atomic Energy held . hearings on radiation and fallout from nuclear tests. November 24, 1959 A Memorandum of Cooperation between the United States and Soviet Union signed by Chaimman McCone and Professor Vasily Emelyanov, Head of the USSR Main Administration for Utilization of Atomic Energy. March 1, 1961 Glenn T. Seaborg named by President Kennedy to be chairman of the Atomic Energy Commission. August 13, 1961 September 1, 1961 East German government began construction of Berlin Wall, which closed all land routes between East and West Berlin. Soviet Union broke nuclear test moratorium, and on October 23 and 30 fired shots estimated at thirty and fifty megatons. September 5, 1961 President Kennedy ordered resumption of underground nuclear testing. September 1961-June 1962 __ The Commission conducted Operaticn December 10, 1961 Nougat at the Nevada Test Site, firing thirty-two shots. As part of Nougat shot "Gname" the first Peaceful Nuclear Explosion (as part of Project Plowshare) was detonated in a salt cavity in Carlsbad, New Mexico. April 24, 1962 President Kennedy authorized resumption April-November 1962 The Commission conducted Operation of atmospheric nuclear weapon testing. Dominic I in the Christmas Island and Johnston Island areas of the Pacific. This was the last U. S. atmospheric test series. 49