Global Risk

Latest Nuclear Weapon Declassifications

05.26.17 | 1 min read | Text by Steven Aftergood

The fact that a particular nuclear weapon has (or does not have) a “dial-a-yield capability” enabling the selection of a desired explosive yield was declassified earlier this year, in a joint decision of the Department of Defense and the Department of Energy.

Last year, the Department of Energy also declassified the thickness of the “getter nickel plating” used in tritium production. (A “getter” here means the reactive material that sustains a vacuum by capturing gas atoms.)

These and several other recent DOE declassification decisions were recorded in memoranda that were released last week under the Freedom of Information Act. Copies are available, along with the records of prior DOE declassification actions, here.

publications
See all publications
Global Risk
Report
Inspections Without Inspectors: A Path Forward for Nuclear Arms Control Verification with “Cooperative Technical Means”

This report outlines a framework relying on “Cooperative Technical Means” for effective arms control verification based on remote sensing, avoiding on-site inspections but maintaining a level of transparency that allows for immediate detection of changes in nuclear posture or a significant build-up above agreed limits.

11.10.25 | 3 min read
read more
Global Risk
Press release
FAS Receives $500k Grant On Emerging Disruptive Technologies and Mobile Nuclear Launch Systems

The grant comes from the Carnegie Corporation of New York (CCNY) to investigate, alongside The British American Security Information Council (BASIC), the associated impact on nuclear stability.

11.06.25 | 3 min read
read more
Global Risk
Blog
Incomplete Upgrades at RAF Lakenheath Raise Questions About Suspected US Nuclear Deployment

Satellite imagery of RAF Lakenheath reveals new construction of a security perimeter around ten protective aircraft shelters in the designated nuclear area, the latest measure in a series of upgrades as the base prepares for the ability to store U.S. nuclear weapons.

10.10.25 | 8 min read
read more
Global Risk
Report
Avoiding Nuclear Danger in Northeast Asia

It will take consistent leadership and action to navigate the complex dangers in the region and to avoid what many analysts considered to be an increasingly possible outcome, a nuclear conflict in East Asia.

10.07.25 | 19 min read
read more