Five men who helped build, maintain, and wield America's nuclear arsenal have emerged as an unlikely group trying to rid the world of those very weapons. Since declaring in a 2007 Wall Street Journal op-ed their commitment to eliminating the nuclear threat, veterans of the Cold War and members of the Nuclear Security Project, including former secretary of state and Hoover fellow George Shultz; former secretary of defense and Hoover fellow William Perry; former secretary of state Henry Kissinger; and former senator Sam Nunn, have pressed governments to reduce their arms and better secure plutonium and other materials used to make nuclear weapons.