The Hidden Workforce Risk in America's Nuclear Modernization

The United States is undertaking its most extensive nuclear modernization effort since the Cold War. Weapons are being modernized while aging production facilities are replaced or expanded. The Department of War is recapitalizing the delivery systems that make up the nuclear triad. Across the Department of Energy’s nuclear security enterprise, laboratories and production sites must sustain the existing stockpile while supporting new weapon programs and rebuilding capabilities that atrophied after the Cold War.

The National Nuclear Security Administration depends on scientists, engineers, technicians, machinists, skilled trades, program managers, safety professionals, and other specialists to maintain and modernize the nuclear weapons stockpile. Roughly 55,000 management and operating contractor employees support the enterprise, overseen by a much smaller federal workforce.[1] Yet headcount alone says little about whether the enterprise has the people it needs in the positions where they are needed.

That means the United States is already several years into an enormous nuclear modernization effort while still developing a complete picture of the workforce required to execute part of it.

The nuclear enterprise does not operate like an ordinary labor market. Hiring a replacement does not necessarily replace the capability that walked out the door.

A newly hired engineer may have the right degree and considerable technical ability. That person does not arrive with years of experience in a particular nuclear facility, familiarity with legacy systems, knowledge of site-specific processes, a security clearance, qualification in specialized work, or the accumulated technical judgment of someone who has spent decades inside the enterprise.

Some nuclear skills take years to develop. GAO reported in 2012 that certain critical skills in the nuclear security enterprise generally required at least three years of on-the-job training in a secure, classified environment. At Los Alamos, officials told GAO that developing a fully qualified nuclear weaponeer with an advanced technical degree could take five to ten years.[3]

That makes workforce capacity an engineering constraint.

NNSA is overseeing an estimated $200 billion nuclear modernization effort and has described its workload as the heaviest in decades. It is simultaneously sustaining and modernizing nuclear weapons while rebuilding production capabilities for plutonium pits, uranium components, high explosives, and non-nuclear components.[4] Those programs draw from many of the same categories of technical talent.

A nuclear engineer assigned to an existing production mission cannot always be moved to a modernization project without affecting the work left behind. The same is true of experienced systems engineers, quality personnel, safety analysts, project managers, skilled trades, and other specialists. New facilities can initially increase demand for experienced personnel because those facilities must be designed, reviewed, constructed, commissioned, qualified, and integrated while legacy facilities continue to perform mission work.

Modernization therefore creates an overlap problem. The old enterprise must keep operating while the new enterprise is built around it.

That overlap is occurring during a period of substantial execution pressure. GAO reported in February 2026 that NNSA was overseeing 28 major construction projects valued collectively at more than $30 billion. Among projects already in the execution phase, cumulative cost overruns had increased from $2.1 billion in 2023 to $4.8 billion as of June 2025, while cumulative schedule delays grew from nine years to 30 years.[5]

Those overruns have multiple causes. GAO identified contractor project management, vendor and subcontractor performance, and higher equipment, material, and vendor costs among them. Workforce limitations should not be used as a catch-all explanation for schedule or cost problems. But an enterprise attempting this volume of technically demanding work has little margin for losing specialized capability in positions that are difficult to refill.

The relevant metric is therefore not simply the number of employees. It is qualified capability.

Consider two organizations, each reporting that it has 100 engineers. In one, senior technical positions have experienced successors, critical qualifications are distributed among several employees, and early-career engineers work alongside experienced personnel long enough to develop independent judgment. In the other, several essential functions depend on one or two people approaching retirement, replacements are still obtaining clearances or qualifications, and senior personnel are divided between current operations and modernization projects.

Both organizations have 100 engineers. They do not have the same engineering capacity.

This distinction matters in nuclear work because many activities operate under deliberate controls intended to prevent low-probability, high-consequence failures. Nuclear criticality safety, weapon safety, configuration management, quality assurance, conduct of operations, radiological protection, and other disciplines depend on formal requirements. Those requirements do not eliminate the need for experienced judgment.

A procedure can tell an engineer what analysis is required. It cannot document every unusual configuration that engineer has seen during 25 years at a facility. A drawing can define a system, but it may not explain why a modification was made decades earlier, what operating experience led to it, or which interfaces have historically caused trouble. A qualification program can establish that someone demonstrated required knowledge. It cannot instantly reproduce judgment developed through hundreds of technical decisions.

This is tacit knowledge, and technical organizations depend on more of it than their staffing tables reveal.

The nuclear enterprise is particularly exposed because much of its work is specialized, classified, and performed at a limited number of sites. The available labor pool is narrower than it is for many commercial industries. GAO reported in 2024 that NNSA contractors generally met planned staffing levels from fiscal years 2018 through 2022, which argues against describing the enterprise as suffering from a universal staffing crisis. The same report found that contractors continued to face recruitment and retention challenges, including a limited applicant pool for technically skilled positions.[1]

This is why the discussion should move beyond whether NNSA is hiring enough people. The better question is whether the nuclear security enterprise has enough qualified people, with sufficient experience, in the disciplines and locations required by the modernization schedule.

That question should be answered program by program and site by site.

NNSA already treats facilities, technologies, materials, suppliers, and funding as resources that can constrain program execution. Human capability deserves the same treatment. GAO identified human-capital gaps as one of the risks facing NNSA’s industrial base in its 2025 review of industrial-base reporting.[6]

Workforce planning should therefore be integrated into technical and program risk management instead of being handled primarily as an aggregate human resources problem.

That begins with identifying positions where the loss of one or two experienced employees would create disproportionate mission risk. The assessment should distinguish between a position being filled and a capability being available. An employee who requires another two years of qualification and experience before working independently cannot be counted the same way as the senior specialist being replaced.

Programs also need to account for the workforce required during transition. Building a replacement facility does not eliminate the staffing requirement for the facility still performing the mission. For some period, the enterprise may need enough qualified personnel to operate the old capability, support construction and commissioning of the new one, train incoming personnel, resolve startup problems, and transfer knowledge before legacy operations end. If that overlap is absent from a resource-loaded schedule, the schedule contains a labor assumption that may not be true.

Knowledge transfer deserves the same discipline.

The common model is to document procedures and capture lessons learned before experienced personnel retire. That is useful, but documentation is an incomplete substitute for overlap. Technical judgment is often transferred through work: reviewing calculations together, troubleshooting unexpected conditions, walking down facilities, challenging assumptions, and explaining why a requirement is applied a particular way.

The transfer has to happen while both people are still there.

There is also a federal oversight issue. GAO reported in 2024 that NNSA’s approximately 1,800 federal employees oversee more than 55,000 contractor employees. NNSA had conducted studies finding that it needed additional federal staff, but GAO found those staffing needs had not been fully incorporated into agency budget requests.[7]

Contractor workforce capacity matters, but so does the government’s ability to act as an informed owner. A technically capable contractor does not eliminate the need for federal personnel who can evaluate contractor performance, understand technical risk, make informed decisions, and distinguish a manageable deviation from an emerging program problem.

That becomes more consequential as modernization spending grows. Government oversight cannot be reduced to processing deliverables and tracking milestones. The government needs enough technical depth to know whether the information behind those milestones is credible.

None of this argues against nuclear modernization. Modernization is necessary because weapons, facilities, and production capabilities have aged and because the strategic environment has changed. The mistake would be to modernize the physical enterprise without treating replacement of specialized human capability with the same discipline.

Money can accelerate construction. It can expand recruiting, fund university programs, increase salaries, and purchase equipment. It cannot instantly manufacture experience.

The July 2026 GAO report gives NNSA a defined planning task. The agency has committed to completing a comprehensive analysis of the workforce and program investments required for its science, technology, and engineering capabilities by the end of 2027.[2] That analysis should do more than estimate future headcount.

It should identify the qualifications required to execute major missions, the time needed to develop those qualifications, concentrations of expertise in small numbers of employees, expected losses of experienced personnel, overlap requirements during facility transitions, and positions where no credible successor exists.

Those findings should appear in program schedules and risk registers. If a project requires five qualified specialists by 2030 and developing each one takes several years, that is a schedule dependency no less real than delivery of a piece of equipment.

The United States has spent years debating whether nuclear modernization programs have enough money and whether facilities can be completed on time. Those are legitimate questions. There is another one: when the facilities are finished and the new weapons enter production, will enough people know how to make the enterprise work?

A nuclear deterrent depends on weapons that are safe, secure, reliable, and available when required. Producing and sustaining those weapons requires people who understand highly specialized systems and can be trusted to make consequential technical decisions.

The United States can replace buildings. It can replace equipment. It can hire employees. Replacing expertise takes time.

Nuclear modernization plans should account for that clock too.

CAPT Jonathan K. Corrado, Ph.D. (U.S. Navy Reserve) works in the nuclear industry.

The views in this article are the author’s own and do not represent the Department of War, the Department of the Navy, or any other organization.

image: LGM-35A Sentinel test booster. (Photo courtesy of Northrop Grumman)

Notes:

[1] U.S. Government Accountability Office, “National Nuclear Security Administration: Improvements Needed for Overseeing Contractor Workforce Recruitment and Retention Efforts,” GAO-24-106861, May 29, 2024,
https://www.gao.gov/products/gao-24-106861.

[2] U.S. Government Accountability Office, “National Nuclear Security Administration: Additional Actions Needed to Plan for Science, Technology, and Engineering Facilities and Workforce Investments,” GAO-26-107904, July 15, 2026,
https://www.gao.gov/products/gao-26-107904.

[3] U.S. Government Accountability Office, “Modernizing the Nuclear Security Enterprise: Strategies and Challenges in Sustaining Critical Skills in Federal and Contractor Workforces,” GAO-12-468, April 26, 2012,
https://www.gao.gov/products/gao-12-468.

[4] U.S. Government Accountability Office, “National Nuclear Security Administration: Fully Incorporating Leading Practices for Agency Reform Would Benefit Enhanced Mission Delivery Initiative,” GAO-25-106675, February 6, 2025,
https://www.gao.gov/products/gao-25-106675.

[5] U.S. Government Accountability Office, “Nuclear Security Enterprise: Assessments of NNSA Major Projects,” GAO-26-107777, February 2026,
https://www.gao.gov/products/gao-26-107777.

[6] U.S. Government Accountability Office, “National Nuclear Security Administration: Reporting on Industrial Base Risks Needs Improvement,” GAO-25-107215, March 14, 2025,
https://www.gao.gov/products/gao-25-107215.

[7] U.S. Government Accountability Office, “National Nuclear Security Administration: Actions to Recruit and Retain Federal Staff Could Be Improved,” GAO-24-106167, May 29, 2024,
https://www.gao.gov/products/gao-24-106167.