Foreword
The United States conducted the world’s first atomic bomb teston July 16, 1945. A month later, the United States dropped atomicbombs on Hiroshima and Nagasaki at the end of World War II. Sincethen, the United States and six other countries have conductednuclear test explosions in the air, underground, and underwaterto help them develop nuclear arsenals.An international halt to nuclear weapons test explosions hasbeen a central objective of U.S. defense policy since it was proposedby President Dwight D. Eisenhower in 1958. In the aftermath ofthe Cold War, many nations have agreed that nuclear weapons testingshould end.The Comprehensive Test Ban Treaty (CTBT),…
