Low-Yield Nuclear Missile Added to Submarine Arsenal, Pentagon Confirms

A new type of low-yield nuclear missile has joined the U.S. military undersea arsenal, the Department of Defense has confirmed, with reports suggesting they pack much less power than the Hiroshima bomb.

These so-called tactical nukes aim to negate similar Russian warheads, designed not to level cities but for use on the battlefield.

The funding and legislation for the W76-2 missile were passed by Congress over the last two budgets, in line with the demands of the Trump administration’s 2018 Nuclear Posture Review (NPR).

A report last week by the Federation of American Scientists claimed that the missile—made by tweaking regular submarine-launched warheads—was now deployed in Trident submarines.

“Each W76-2 is estimated to have an explosive yield of about five kilotons,” they wrote in their report.

That’s about one third the explosive power of the “Little Boy” nuclear bomb dropped on Hiroshima during WW2.

The Department of Defense confirmed today that the submarine-launched W76-2 missile had been fielded, but provided no further details, other than outlining the rationale for its creation.

John Rood, Under Secretary of Defense for Policy, said in a statement, “In the 2018 Nuclear Posture Review, the department identified the requirement to ‘modify a small number of submarine-launched ballistic missile warheads’ to address the conclusion that potential adversaries, like Russia, believe that employment of low-yield nuclear weapons will give them an advantage over the United States and its allies and partners.”

The precise explosive power of the warhead is not confirmed.

A Trident Ii, Or D-5 Missile, is launched from an Ohio-class submarine in this undated file photo. (Getty Images)

A report by the Congressional Research Service (CRS) earlier this year noted that the W76-2 would be configured “for primary-only detonation,” as per the NPR.

According to the CRS report, “This could mean a yield of less than 10 kilotons.”

The United States already has low-yield nuclear weapons. However, these were limited to cruise missiles and B61 bombs, with limited capacity to pierce the defenses thrown up by Russia in recent years.

Russia has been growing its arsenal of low-yield nuclear weapons, according to the NPR.

“The recent Russian statements on this evolving nuclear weapons doctrine appear to lower the threshold for Moscow’s first-use of nuclear weapons,” according to the NPR. “Russia demonstrates its perception of the advantage these systems provide through numerous exercises and statements. Correcting this mistaken Russian perception is a strategic imperative.”

Some reports in the previous two or three years had already suggested that the United States should consider submarine-based low-yield weapons of its own to counter the Russian threat.

Opponents of the W76-2 say that it increases the risk of nuclear war. They argue that its reduced destructive power could make it a more tempting option than the unthinkable full-scale nuclear option—but that its use would quickly escalate.

The NPR emphasized that the intention of the low-yield missile was to reduce the possibility of nuclear conflict, not to raise it.

“To be clear, this is not intended to enable, nor does it enable, ‘nuclear war-fighting.’ Nor will it lower the nuclear threshold,” read the NPR. “Rather, expanding U.S. tailored response options will raise the nuclear threshold and help ensure that potential adversaries perceive no possible advantage in limited nuclear escalation, making nuclear weapons employment less likely.”

The new missiles will travel under the ocean on the Navy’s Ohio-class submarines, along with the submarine-based Trident missiles which make up a third of the nuclear “triad.” The other two legs are currently the long-range B-2 and B-52 stealth bombers and the Minuteman 3 missiles scattered throughout the United States.

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Author: Simon Veazey

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