The Department of Defense announced its pursuit of a nuclear bomb that will be 24 times more powerful than one of the bombs dropped on Japan during World War II.

The Pentagon is seeking congressional approval and funding to pursue a modern variant of the B61 nuclear gravity bomb, which will be designated the B61-13, according to a DoD press release.

“Today’s announcement is reflective of a changing security environment and growing threats from potential adversaries,” Assistant Secretary of Defense for Space Policy John Plumb said in the release. “The United States has a responsibility to continue to assess and field the capabilities we need to credibly deter and, if necessary, respond to strategic attacks, and assure our allies.” 

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An F-16 from Tyndall Air Force Base, Florida, one of several U.S. aircraft capable of carrying nuclear weapons. (U.S. Air Force photo by MSgt. Don Taggart)

A fact sheet included with the release said the B61-13 will have a similar yield to the B61-7, which according to a Defense News report, has a maximum yield of 360 kilotons. The load is 24 times larger than the bomb dropped on Hiroshima, Japan, during World War II, which was about a 15 kiloton bomb. The B61-13 would also be about 14 times larger than the bomb dropped on Nagasaki, which was 25 kilotons.

According to the fact sheet, the powerful new bomb will also “will include the modern safety, security, and accuracy features of the B61-12.”

The announcement comes after the U.S. conducted a high-explosive experiment at a nuclear test site in Nevada earlier this month, which Corey Hinderstein, deputy administrator for defense nuclear nonproliferation at the National Nuclear Security Administration, said was meant to advance “our efforts to develop new technology in support of U.S. nuclear nonproliferation goals.” 

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“They will help reduce global nuclear threats by improving the detection of underground nuclear explosive tests,” Hinderstein said of the experiments.

The test came as Russia was largely expected to announce it was pulling out of the 1966 Comprehensive Nuclear Test Ban Treaty, which was designed to ban nuclear explosions anywhere in the world. However, the treaty was never ratified by China, India, Pakistan, North Korea, Israel, Iran and Egypt.

Russian President Vladimir Putin. (Reuters)

The new bomb will be deliverable by modern aircraft, the release notes, and will be designed to give the president options to strike hard and large-area military targets.

If approved, the bomb would replace some of the current B61-7s currently in the U.S. nuclear stockpile instead of increasing the size of U.S. nuclear stocks, the release noted.

The Pentagon is seen from a flight taking off from Ronald Reagan Washington National Airport in Arlington, Virginia. (Alex Wong/Getty Images)

“The B61-13 represents a reasonable step to manage the challenges of a highly dynamic security environment,” Plumb said. “While it provides us with additional flexibility, production of the B61-13 will not increase the overall number of weapons in our nuclear stockpile.”