Signing of the Partial Test Ban Treaty, 5 August 1963. Secretary of State Dean Rusk signing for the United States; Foreign Minister Andre Gromyko, signing for the Soviet Union; and Lord Hume signing for the United Kingdom. Photo: CTBTO. Note: The following essay by Daryl G. Kimball and Wade Boese was originally published in the October 2003 issue of Arms Control Today as " Limited Test Ban Treaty Turns 40" Like all first steps, it was long awaited, tentative, and not without risk. Yet, it also held out promise. The Limited Test Ban Treaty (LTBT) , the first agreement negotiated to regulate...