U.S. Strategic Nuclear Forces

Even though the United States has reduced the number of warheads deployed on its long-range missiles and bombers, consistent with the terms of the 2010 New START Treaty, it is also developing new delivery systems for deployment over the next 10-30 years. Congress will review plans for U.S. strategic nuclear forces during the annual authorization and appropriations process, and as it assesses the costs of these plans in the current fiscal environment. At the present time, the U.S. land-based ballistic missile force (ICBMs) consists of 400 land based Minuteman III ICBMs, each deployed with one warhead, spread among a total of 450 operational launchers. This force is consistent with the New START Treaty.

The Air Force has modernized the Minuteman missiles, replacing and upgrading their rocket motors, guidance systems, and other components, so that they can remain in the force through 2030. It has initiated a program to replace these with a new Ground-based Strategic Deterrent beginning around 2029.

The U.S. ballistic missile submarine fleet currently consists of 14 Trident submarines. Each can carry 20 Trident II (D-5) missiles—a reduction from 24 missiles per submarine—with the total meeting the launcher limits in the New START Treaty. The Navy converted 4 of the original 18 Trident submarines to carry nonnuclear cruise missiles. Nine of the submarines are deployed in the Pacific Ocean and five are in the Atlantic. The Navy also has undertaken efforts to extend the life of the missiles and warheads so that they and the submarines can remain in the fleet past 2020. It has designed and is beginning production of the new Columbia class submarine that will replace the existing fleet beginning in 2031.

The U.S. fleet of heavy bombers includes 20 B-2 bombers and 40 nuclear-capable B-52 bombers. The B-1 bomber is no longer equipped for nuclear missions. This fleet of 60 nuclear-capable aircraft is consistent with the U.S. obligations under New START. The Air Force has begun to retire the nuclear-armed cruise missiles carried by B-52 bombers, leaving only about half the B52 fleet equipped to carry nuclear weapons. The Air Force plans to procure both a new long-range bomber, known as the B-21, and a new long-range standoff (LRSO) cruise missile during the 2020s. DOE is also modifying and extending the life of the B61 bomb carried on B-2 bombers and fighter aircraft and the W80 warhead for cruise missiles.  Purchase this Volume