Navy Extends, Upgrades Sub-Launched Nuclear Weapons to 2080

Staff, Scout Warrior
20 August 2017

The Navy has already been working on technical upgrades to the existing submarine-launched Trident II D5 nuclear missiles in order to prevent obsolescence and ensure the missile system remains viable for decades to come.
Lockheed Martin Space Systems has received a $22.2 million contract for material, labor and support services for the U.S. Navy's Trident II D5 submarine-launched ballistic missile production.
The US Navy is accelerating upgrades to the nuclear warhead for its arsenal of Trident II D5 nuclear-armed submarine launched missiles -- massively destructive weapons designed to keep international peace by ensuring and undersea-fired second-strike ability in the event of a catastrophic nuclear first strike on the US.
Navy Strategic Systems leaders have emphasized the need for long-term sustainment of the triad's sea-based leg, creating a need to maintain submarine-launched nuclear weapons to 2080.
The Navy has also been working on the missile's MK 6 guidance system to continue specific work on the weapon's electronic modules.
As part of the technical improvements to the missile, the Navy is upgrading what's called the Mk-4 re-entry body, the part of the missile that houses a thermonuclear warhead. The life extension for the Mk-4 re-entry body includes efforts to replace components including the firing circuit, Navy officials explained.
Navy and industry engineers have been modernizing the guidance system by replacing two key components due to obsolescence - the inertial measurement unit and the electronics assembly, developers said.
The Navy is also working with the Air Force on refurbishing the Mk-5 re-entry body which will be ready by 2019, senior Navy officials said.
Navy officials said the Mk-5 re-entry body has more yield than a Mk-4 re-entry body, adding that more detail on the differences was not publically available.
The missile also has a larger structure called a release assembly which houses and releases the re-entry bodies, Navy officials said. There is an ongoing effort to engineer a new release assembly that will work with either the Mk-4 or Mk-5 re-entry body.
The Trident II D5, first fired in the 1990s, is an upgraded version of the 1970s-era Trident I nuclear weapon; the Trident II D5s were initially engineered to serve until 2027, however an ongoing series of upgrades are now working to extend its service life.
The 44-foot long submarine-launched missiles have been serving on Ohio-class submarines for 25 years, service leaders explained.
The missiles are also being planned as the baseline weapon for the Columbia-class ballistic missile submarines.
Under the U.S.-Russia New START treaty signed in 2010, roughly 70-percent of the U.S.' nuclear warheads will be deployed on submarines.
Within the last several years, the Navy has acquired an additional 108 Trident II D 5 missiles in or
Trident II D5 Test Firing from the Atlantic Ocean off the coast of Florida in recent years, a specially configured non-armed "test" version of the missile was fired from the Navy's USS Maryland. This was the 161st successful Trident II launch since design completion in 1989, industry officials said.
The missile was converted into a test configuration using a test missile kit produced by Lockheed Martin that contains range safety devices, tracking systems and flight telemetry instrumentation, a Lockheed statement said.
The Trident II D5 missile is deployed aboard U.S. Navy Ohio-class submarines and Royal Navy Vanguard-class to deter nuclear aggression. The three-stage ballistic
missile can travel a nominal range of 4,000 nautical miles and carry multiple independently targeted reentry bodies.
The U.S. and UK are collaboratively working on a common missile compartment for their next generation SSBNs or Columbia-Class ballistic missile submarines.
The 130,000-pound Trident II D5 missile can travel 20,000-feet per second, according to Navy figures. The missiles cost $30 million each.
The "Bulletin of the Atomic Scientists" further describes the weapon -- "The Trident D5s carry three types of warheads: the 100-kiloton W76/Mk-4, the 100-kiloton W76-1/Mk-4A, and the 455-kiloton W88/Mk-5 warhead, the highest-yield ballistic missile warhead in the U.S. arsenal."