The work performed by Los Alamos National Laboratory at the Nevada National Security Sites helps maintain the credibility of the U.S. nuclear deterrent and reinforces a commitment to global security.

A brief overview of the Nevada National Security Sites (NNSS).

The Los Alamos office helps streamline Lab work at the Nevada National Security Sites.

Los Alamos Operations develops technology for the nuclear security enterprise.

Scientists study shallow earthquakes to understand how they differ from underground explosions.

Mock assemblies of nuclear weapons are put to the test just 160 miles northwest of Las Vegas.

Los Alamos scientists send innovative technology soaring.

Los Alamos scientists developed and tested nuclear rocket engines at the Nevada Test Site.

A Los Alamos–led experiment paves the way for groundbreaking studies.

Nearly 30 foreign military officers attended the Los Alamos Defense Attaché Orientation Program.

The 928 nuclear tests that occurred in Nevada before 1992 continue to inform the modern nuclear weapons stockpile.

A former nuclear testing director reflects on U.S.–Soviet relations during the Cold War.

The Los Alamos National Laboratory team at Kappa West, a remote firing site in the Nevada desert, handles large explosive experiments.

Subcritical experiments below the Nevada desert ensure reliable nuclear weapons.

Three devices allow scientists to probe plutonium implosions.

Conducting a subcritical experiment requires many complex steps.

Behind every subcritical experiment is an army of people and years of work.

Los Alamos containment scientists ensure no contamination is released.

Los Alamos National Laboratory’s first new confinement vessel in 20 years is ready to shape the future of national security.

At the National Criticality Experiments Research Center, scientists conduct innovative experiments that can’t be completed anywhere else.

Decades after their creation, the four critical assemblies at the National Criticality Experiments Research Center continue to enable vital research.

On its 75th anniversary, Mission Support and Test Services President Roger Rocha leads the Nevada National Security Sites into the future in partnership with Los Alamos and others.

For more than four decades, Tom Sandoval has supported nuclear weapons and nonproliferation experiments at the Nevada National Security Sites.