ALSO SEE: Trump Moves to Fire Staff Overseeing Nuclear Weapons Then Backtracks

The Energy Department is seeking to bring back nuclear energy specialists after abruptly telling hundreds of workers that their jobs were eliminated, according to two people familiar with the matter.

The employees, responsible for designing and maintaining the nation’s cache of nuclear weapons at the National Nuclear Safety Administration, were part of a larger wave of workers dismissed from the Energy Department, drawing alarm from national security experts. Between 300 and 400 NNSA workers were terminated, according to a person familiar with the matter.

The agency’s quick reversal was announced Friday in an all-staff meeting. The NNSA is seeking to recall the workers because they deal with sensitive national security secrets, according to the people, who weren’t authorized to talk about the matter, which is not public.

Those cuts are especially concerning because the positions typically require high-level security clearances and training that can take 18 months or longer, said Jill Hruby, who served as the NNSA administrator during the Biden administration.

“These people are likely never going to come back and work for the government,” Hruby said in a phone interview. “We’ve had a very active program requiring an increase to our staff so the indiscriminate layoffs of people will be really difficult for the coming years.”

The firings — part of a wave of terminations across the federal government this week spurred by Elon Musk’s Department of Government Efficiency — underscore the chaos as the world’s richest man seeks to quickly overhaul the federal bureaucracy in Trump’s image. At the Small Business Administration earlier this week, some workers who were told they were being fired, received a second message telling them that they weren’t being terminated and that their jobs were safe — only to receive a third message telling them they were, in fact, out of a job.

The NNSA firings were part of a wider swath of dismissals across the Energy Department, which included employees at the Loan Programs Office, a recently formed unit to fund clean energy projects, the group responsible for preventing cyberattacks against the power grid, and the department’s general counsel office.

The Energy Department and the NNSA did not respond to requests for comment.

Nuclear Programs

The NNSA is a semi-autonomous arm of the Energy Department responsible for producing and dismantling nuclear weapons, providing the Navy with nuclear reactors for submarines and responding to radiological emergencies, among other duties.