The Congressional Budget Office (CBO) estimates that over the 2015–2024 period, the Administration’s plans for nuclear forces would cost $348 billion, an average of about $35 billion a year, and an amount that is close to CBO’s December 2013 estimate of $355 billion for the 2014–2023 period. (Both estimates are given in nominal dollars; that is, they include the effects of inflation.) Although the two estimates of total costs are similar, projected costs for nuclear programs of both the Department of Defense (DoD) and the Department of Energy (DOE) have changed. Over the next 10 years, CBO estimates, DoD’s costs would total $227 billion, which is about $6 billion (or 3 percent) more than the 10-year estimate published in 2013, and DOE’s would total $121 billion, which is about $13 billion (or 9 percent) less than CBO’s 2013 estimate.
A nuclear triad refers to a nuclear arsenal which consists of three components, traditionally strategic bombers, intercontinental ballistic missiles (ICBMs), and submarine-launched ballistic missiles (SLBMs). The purpose of having a three-branched nuclear capability is to significantly reduce the possibility that an enemy could destroy all of a nation’s nuclear forces in a first-strike attack; this, in turn, ensures a credible threat of a second strike, and thus increases a nation’s nuclear deterrence.
SOURCES – Congressional Budget Office, Wikipedia