President Lyndon Johnson looking on as Secretary of State Dean Rusk prepares to sign the NPT, 1 July 1968.(Source: Lyndon B. Johnson Presidential Library.) By Daryl G. Kimball Forty-five years ago today, the United States, the Soviet Union, the United Kingdom, and dozens of other countries signed the nuclear Nonproliferation Treaty (NPT) at ceremonies in Washington, Moscow, and London. In his remarks at the July 1, 1968 signing ceremony , U.S. President Lyndon Johnson called it "... a very reassuring and hopeful moment in the relations among nations. We hope and expect that virtually all the...