The purpose of the paper is to state the rationale upon which the Joint Chiefs of Staff (JCS) bases its opposition to further extension of the Limited Test Ban Treaty (LTBT). The argumentation of the paper is hinged primarily on the contention that the USSR is ahead of the US in nuclear weapon technology. Accordingly, there is much for the US to do, so that the Soviets do not, primarily through the deployment of an Anti-Ballistic Missile [ABM] system, alter the strategic balanc the US should not agree to further restrictions on testing which would prevent the US from correcting the deficiencies of its strategic deterrent systems and making developments necessary for a Nike-Zeus warhead.