Physicists and engineers now realize that just as most car crashes stem from driver error rather than mechanical failure, the same logic applies to nuclear weapons, their platforms, and their potential use. Whether Americans like it or not, humans are in the system and humans are, almost certainly, the weakest link.

Humans are the weakest component in the quantification of margins and uncertainty (QMU) sense. Engineers often test individual components and larger systems of nuclear weapons to a 1-in-1,000 certainty that they will function correctly. There has long been a view that nuclear weapons should always detonate when employed and never when they are not. To achieve this “always/never” goal, systems are engineered to perfection while largely ignoring sources of human error.

Humans design and manufacture the components, assemble the weapons, complete the wiring, and install systems onto delivery platforms (i.e., subs, silos, and bombers). Humans verify satellite signals of potential attacks from US Strategic Command, communicate those findings to the President, and, depending on the response, draft and transmit emergency action messages (EAMs). This is a gross simplification because fragile humans play a much larger role, but it illustrates the embeddedness of the human element in the system.

One example of human fragility that took place in September 2023 at the Pantex Plant is instructive. It appears a worker mistakenly cross-connected color-coded electrical wires inside a nuclear weapon.

Across the world this very task might be performed by a civilian or by an Air Force 2W2X1 Nuclear Weapons Specialist. At first glance, it seems simple; connect the red wire to the red wire and the green wire to the green wire. But around 8 percent of men are born with red-green color vision deficiency (color blindness) that makes it difficult for them to differentiate between red and green (and many other color combinations. The US Air Force correctly requires normal color vision for this role.

Not all color tests are created equal. Some vision tests catch 99 percent of people with colorblindness and others catch 90 or even 50 percent of colorblind individuals. An analogy may be useful in illustrating this point.

If, for example, a worker was testing a component and needed to detect 14MeV neutrons, a detector that simply says “between 2 and 20 MeV neutrons were detected” would be unacceptable. A tester with adequate sensitivity is required to test critical components. Detectors that verify the specific reading may even be required. Sensitive tests for humans who work on nuclear weapons is also required.

The Federal Aviation Administration (FAA) recently updated its standards, rejecting the century-old Ishihara color vision test and the D-15 test due to known shortcomings. The Ishihara test is fairly good at detecting red-green defects but will miss 100 percent of blue (Tritan) defects. Humans have red, green, and blue light sensitive cones in their eyes, and the Ishihara only tests two cones and ignores blue vision entirely. The D-15 test can pass up to half of individuals with color blindness, depending on how its administered (a test commonly used by police departments).

Figure 1. Simulated Color Vision Defects and Wire Color

Even if Pantex adopted one of the FAA’s “best in class” tests, such as the CAD, Rabin, or Waggoner Computerized Color Vision Test (WCCVT), there is still another issue—test frequency. Color vision should be tested periodically, not just once.

While 8 percent of men and 0.5 percent of women) are born with color blindness, it is expected that 15 percent of all people will develop an acquired color vision deficiency during their lifetime, most often affecting blue vision. Most people assume color vision is a static ability, but it is more like hearing loss, which is impacted by age and environmental factors.

Changes in color vision ability can occur rapidly due to medications, diseases, or environmental conditions. For critical roles, annual color vision testing should be a minimum standard.

Finally, different color vision tests examine different axes within the visible spectrum of light, meaning that a person could pass the Rabin but fail the WCCVT based on individual differences and the specific axis tested by each test. This is truer for mild vision defects but mild defects can still cause sub-par performance on real world tasks (i.e., reacting to red traffic lights).

Across the United States, teams are working to quantify this human element in complex, high-consequence systems. These include the Air Force’s 711th Human Performance Wing and the social scientists at Sandia National Laboratories.

The next time you hear about a cognitive psychologist, industrial-organizational psychologist, or human factors researcher at a national lab, do not assume they’re experimenting with LSD and goats to perfect psychic warfare. They’re far more likely to be studying how humans interact with technology—quantifying behavior, limitations, cognition, and the human’s reliability within critical systems.

Organizations should, whenever possible, bring these human-focused professionals into projects. They will identify issues most engineers never consider across a variety of scales, “from neurons to nations.” Factors like color vision, tool slips, (as in the Louis Slotin “demon core” incident), dropped sockets (as in the Titan II missile explosion in Damascus, Arkansas), mismatched job abilities, fatigue, attention lapses, and even intentional sabotage can all impact the nation’s deterrence posture. When processes are optimized to include the human, overall risk is minimized.

In the end, deterrence is not just about weapons. It is about the humans behind the weapons, the fallible, unpredictable, indispensable human element that remains both our greatest strength and our greatest risk.

Rob Kittenger, PhD, is a Senior Fellow at the National Institute for Deterrence Studies. The views expressed are his own.

Meet the Human in Nuclear Deterrence was originally published on Global Security Review.

As it stands, Ukraine cannot rely entirely on aid packages from Europe and especially not the US who, under Trump, is taking a much more careful role in European conflict. So far, support for Ukraine from the international community is limited, costly, and dependent on repayment either in natural resources or as the United Kingdom said, “the extraordinary profits on immobilized Russian sovereign assets.”

There are certain things which, due to their higher cost, Ukraine must receive from aid deals with foreign governments, such as missile systems and larger manned vehicles. These more expensive items must be produced by larger defense contractors as they have greater access to raw materials and a larger production budget. UAVs, however, can be produced as effectively by smaller companies which are able and willing to provide the Ukrainian government a better deal financially. Over the past few years, a German AI company, Helsing, has filled an important role in providing affordable drone systems to the Ukrainian military. Four thousand reconnaissance drones, designed and manufactured by Helsing, are already operational in Ukraine, and a recent deal was struck to provide 6,000 of their new HX-2 attack drones.

The HX-2 attack drones are similar in design to the Russian Lancet drone, produced by Russian aerospace giant ZALA, but come with a few key advantages and innovations. The HX-2 is technologically advanced and able to avoid signal disruption, a feature which can transform drone capabilities on the Ukrainian battlefield. The engagement range is also far higher, at 100 kilometers (km) compared to the Lancet’s 40–60 km. Helsing is the developer of an AI software which allows the drones to travel on missions in a swarm, where many are piloted by one individual, allowing for incredibly destructive capabilities.

The key advantage of a company like Helsing, over a larger aerospace company with a wider range of products, such as ZALA, is the significantly lower production cost, which Helsing offers. Helsing has plans to increase output, building “resilience factories” across Europe, which allow for countries to carry out domestic production.

The Ukrainian government clearly spotted some of the advantages in giving smaller defense companies the opportunity to develop new and innovative products. Brave1 is an initiative run by the Ukrainian government, where investors, engineers, defense companies, and military experts are able to meet to address some of the gaps and issues that Ukraine faces on the battlefield. The idea is to fix issues and fill gaps as fast as possible, and so far, it has been successful. The Ukrainian government incentivizes both smaller and larger technology companies to innovate by offering them a shot at a lucrative government contract.

Another similar program aimed at kickstarting innovation in the European defense industry is the Darkstar Coalition. Listed as one of the partners of Brave1, Darkstar is a team of European tech start-up owners and investors who joined forces to boost European defense. Darkstar hosted two boot camps, where small tech start-ups demonstrate their creations and compete for the winning prize: cash to expand their operations. A third boot camp will take place in Spring of 2025, with a total of €1.5 million awarded to the two most successful companies. Even companies which do not win the funding will benefit from attending, as they are given the opportunity to carry out field testing, network with other companies, gain technical advice, and potentially receive funding externally from other interested attendees. The success of the boot camps demonstrates the previously underutilized talent and innovative ability in Europe in sectors such as engineering, robotics, AI, and cybersecurity. When incentivized and supported, these smaller start-ups can have a real impact on the war in Ukraine and European security more broadly.

It is not just defense manufacturing companies that are stepping up to meet the changing requirements of the Ukrainian government, but also AI programming companies such as Swarmer are also innovating. Swarmer is a company that creates drone swarm programs with huge capabilities in modern warfare. It is also a company which is consistently present at Brave1 tech summits, meeting with investors and Ukrainian military officials.

As the war enters a new phase, with reduced support from the US and the prospect of limited support from Europe, stretching the Ukrainian defense budget as far is it will go will become even more of a priority. This is where these smaller defense and tech start-ups will thrive. Whilst giants such as Lockheed Martin, BAE, or Airbus typically fill a majority of the orders during long-term conflicts, Ukraine recognized the power in allowing smaller, newer, more nimble defense technology companies to innovate.

Raphael Chiswick is an independent author. Views expressed are his own.  

AI Defense Start-ups was originally published on Global Security Review.

Though data on the breakdown of aerospace engineers employed in space-related projects versus solely terrestrial-based aircraft is not readily available, the above statistic represents a worrying trend for a field (space) that is heavily reliant on aerospace engineers and at the center of American preeminence. More concerning, it is important to also ask if these known unemployment numbers are a deterrent for graduates entering into a dedicated space-focused workforce. Space is a critical part of national security and without a comprehensive understanding of how to entice applicants into priority positions, the new space race with China may not be so easily won.

On the surface, the situation does not appear dire. The Bureau of Labor Statistics estimated aerospace engineering jobs should grow by 6 percent between 2021 and 2031. However, the Bureau of Economic Analysis reported that the number of space private-sector jobs is down 12,000 from a decade prior. Additionally, an article from major consultant McKinsey & Company noted an 8 percent decline in aerospace, aeronautical, and astronautical engineering hires over the past five years within the broader aerospace and defense sector. It characterized the situation as an “intense competition for talent,” with younger graduates more interested in pursuing the highly lucrative computer and software engineering careers.

“Right now, we have a STEM crisis,” Mel Stricklan of the Space Workforce 2030 initiative spoke in an interview at the 39th Space Symposium. Further exacerbating the space employment challenge is how the overall number of science, technology, engineering, and math (STEM) graduates decreased despite the number of job openings increasing. As the purpose of her organization’s mission is to develop the next base of qualified professionals, Stricklan was passionate in suggesting, “The next generation needs to understand that they have a place in space.” In the same interview, Mike French, formerly Vice President of Space Systems for the Aerospace Industries Association, warns companies need to pay attention to their retention rates, the impact of retirements on workforce demographics, and security clearance requirements dissuading applicants.

According to Pew Research, a majority of Americans believe the US needs to be a leader in space, including from within the private sector. Though analysts predict a space market valuation of over $1 trillion in under a decade, it is not yet clear if the path to reach this estimate is through increasing the number of professionals and therefore varied projects in the industry or by simply increasing the price to fund space projects already in existence.

For a recent parallel example, the collapse of cryptocurrency bank FTX was in part due to customers discovering sister-company Alameda Research artificially propped up the value of FTX by inflating the value of FTX’s nascent exchange coin rather than providing liquidity backed by fiat or already proven cryptocurrencies. Looking at the current trends in the space market, the Space Launch System rocket produced by Boeing keeps increasing in cost for the Artemis lunar exploration mission despite NASA’s goal to switch contracting methods. Young graduates may be paying attention to these trends and hedging their bets elsewhere.

As Americans wait for the space tourism industry to flourish, traditional aerospace companies are generally limited to selling only to governments and major commercial companies. When a project cancellation hits the industry, such as the OSAM-1 satellite mission, the engineering specialists and mission support staff find themselves in a precarious position of not knowing if they will remain employed. Following this development came whispers of more contractor layoffs hitting the Goddard Space Flight Center after previous cuts in 2023, although NASA committed to funding the 450 personnel working on the program through fiscal year 2024. The recent news of cuts at NASA’s Jet Propulsion Laboratory, which saw 8 percent reductions of the workforce following budget cuts to the Mars Sample Return program, also adds to the uncertainty of job stability for the space industry. Without a new project to immediately switch to, the unemployment rate of aerospace engineers may be partially explained by this phenomenon.

A lack of understanding of why engineers are moving away from space-related careers displays an incongruity within a space strategy that calls for the integration of commercial and military space capabilities. Paid training and a guaranteed job after completion will be necessary to persuade the upcoming Generation Z to choose a space career. Regardless of the numerous factors contributing to a decreasing space workforce, companies and government agencies must first recognize the extent of the problem before an adequate solution can be developed. Whatever solution industry and government leaders may choose, it is important it comes soon.

Alexis Schlotterback is an Analyst at the National Institute for Deterrence Studies. Views expressed in this article are the author’s own. 

Is the United States Losing Aerospace Engineers? was originally published on Global Security Review.