US

Asof early 2015, the authors estimate that theUSDefenseDepartmentmaintains about 4,760 nuclearwarheads. Of this number, they estimate that approximately 2,080 warheads are deployed while 2,680 warheads are in storage. In addition to the warheads in the Defense Department stockpile, approximately 2,340 retired but still intact warheads are in storage under the custody of the Energy Department and awaiting dismantlement, for a totalUS inventory of roughly 7,100warheads. SinceNewSTARTentered into force inFebruary 2011, theUnited States has reported cutting a total of 158 strategic warheads and 88 launchers. It has plans tomake some further reductions by 2018. Over the next decade, it also plans to spend as much as $350 billion on modernizing and maintaining its nuclear forces