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.

While many analysts argue that this deal covers Pakistan’s nuclear weapons, the reality is that this agreement augments the already existing strategic partnership rather than providing Saudi Arabia with a nuclear umbrella. Neither Pakistan’s nuclear policy nor its doctrine entails providing extended nuclear deterrence to any other state while Islamabad’s deterrence posture remains India-specific and does not extend to providing a nuclear umbrella to any state.

Islamabad and Riyadh have been tied in a mutual defense pact for decades. Pakistani forces, which account for 1,500–2,000 troops, provide operational and technical help to Saudi forces. In regional conflicts, Pakistan safeguards Saudi frontiers under the defense protocol of 1967. Over time, Pakistan trained approximately 8,000–10,000 Saudi military personnel.

The recent strategic mutual defense agreement further strengthens the historical alliance between Pakistan and the Kingdom of Saudi Arabia (KSA), rather than creating a new pact. Even previous defense agreements do not guarantee a “nuclear umbrella.” In a similar vein, the recent mutual defense pact between Pakistan and the KSA serves the purpose of signaling solidarity and strategic cooperation, rather than providing an unconditional military guarantee for Saudi Arabia.

Pakistan does not seek to assume the role of a regional security guarantor. Rather, it contributes to collective security in line with international law and its national interests. However, Islamabad can be an essential actor in collective security arrangements in the Middle East in accordance with the norms of international law.

As the Israeli air raid on Doha sent shockwaves across the globe, Gulf States, particularly Saudi Arabia, realized that the United States is unlikely to go to the defense of its Gulf partners in times of crisis, despite deep ties with the Kingdom.

The reliability of the US as a security guarantor to its Arab partners in the Gulf region diminished after the United States tolerated the Israeli bombing of Hamas leadership in Doha, Qatar, September 9, 2025. Al-Udeid Air Base, in Qatar, is the largest US military base in the Middle East with 10,000 active troops.

Israel’s attack against Hamas leadership in Doha also infuriated Gulf countries. However, the lack of action by the US against its ally for the airstrike in Doha has damaged the image of the US as a reliable security partner. Therefore, Arab states are exploring new partners for their security against Israeli aggression.

Pakistan, with its battle-tested military and cordial relations with Gulf monarchies, appears to be a natural partner for the KSA. Its decades-old alliance with the KSA is rooted in deep strategic interests, shared faith, and economic interdependence. The presence of 2.7 million Pakistanis in the KSA also matters as they contribute over $6 billion in annual remittances. Pakistan’s reliance on Saudi oil imports is also important. These factors deepen mutual trust and economic interdependence.

Together, they reinforce the strategic logic behind the Pakistan–Saudi Mutual Defense Pact. Additionally, Pakistan’s participation in Saudi Arabia’s Vision 2030 projects highlights opportunities for long-term economic integration and strategic cooperation.

The cardinal aspect of this new mutual defense pact lies in formalizing a deep alliance which has historical roots. With this agreement, both Islamabad and Riyadh vow joint deterrence against any aggression, institutionalizing their long-standing security cooperation. Both Pakistan and KSA view this pact as an outcome of a decades-old partnership, not a sudden alliance aimed at any adversary, as Pakistani officials reiterated in their statements. Similar to the previous defense agreements between Islamabad and Riyadh, this agreement does not offer any nuclear guarantee to the KSA.

Therefore, the idea of a nuclear umbrella remains speculative and the actual text of this mutual pact, along with Pakistan’s stated nuclear doctrine, does not support it. Operational readiness and interoperability of both states’ armed forces will be significantly improved. The pact will foster defense industry collaboration on emerging technologies such as cybersecurity, drone technology, and space-based defense systems between both states. It will enable the co-production of conventional military equipment as well, paving the way for a promising future of strategic cooperation between Islamabad and Riyadh.

It may also be pointed out that Pakistan has not offered a covert “nuclear button” to Riyadh and defense cooperation with Riyadh does not imply an automatic war pledge. While addressing the 80th session of the United Nations General Assembly (UNGA), Iranian president, Masoud Pezeshkian, also praised this defense deal between the two brotherly Muslim states, marking the pact as the beginning of a comprehensive regional security system.

A Pak–Saudi mutual defense pact enhances Pakistan’s strategic depth by reinforcing its defense cooperation with the Muslim world’s most influential state, thereby expanding Islamabad’s diplomatic leverage beyond South Asia. The pact bolsters Pakistan’s deterrence posture vis-à-vis India, as Riyadh’s political and strategic backing adds weight to Pakistan’s regional standing.

Economically, it promises deeper defense collaboration, potential joint production, and technology transfer. In December, the KSA loaned Pakistan $3 billion, shoring up its foreign exchange reserves, while politically reflecting its growing confidence in Pakistan’s professional military capability and responsible nuclear stewardship. In essence, the agreement strengthens Pakistan’s strategic autonomy, broadens its alliances, and projects it as a pivotal player in the evolving security architecture of the Muslim world.

Nawal Nawaz is a Research Assistant at the Center for International Strategic Studies (CISS).

Understanding the Pakistan–Saudi Defense Agreement was originally published on Global Security Review.

In nuclear deterrence, where the stakes are high and the consequences of failure are catastrophic, narratives play a crucial role in shaping strategy and influencing outcomes. Narratives surrounding nuclear weapons have profound effects on perceptions of credibility, intentions, and, ultimately, shaping the behavior of states. Understanding the role of narratives in nuclear deterrence is essential for policymakers and strategists seeking to navigate the complexities of nuclear politics.

Role of Narratives in Shaping Perceptions of Credibility

Narratives are important in nuclear deterrence strategy in shaping perceptions of credibility. The credibility of a state’s nuclear deterrent is essential for its effectiveness in deterring potential adversaries. States that possess clear escalation dominance and nuclear superiority will hold an advantage in perceptions of resolve and strength. However, credibility is exclusively tied to a state’s willingness to use the bomb.

In the United States, the president is responsible for influencing the perceptions of his adversaries through crafting a compelling narrative that will properly induce fear into his enemy. Narratives that emphasize a state’s willingness and capability to use nuclear weapons can enhance its deterrence posture, dissuading others from taking aggressive actions. The only other way to enhance credibility beyond strategic narratives is to employ nuclear weapons in some capacity. Such acts are unpalatable for moral and ethical reasons, which leaves crafting convincing narratives as the preferred means of influencing an adversary.

Influencing Perceptions of Intentions

Narratives also influence perceptions of intentions. States often use narratives to signal their intentions and clarify their strategic objectives. For example, a state may adopt a narrative of minimum deterrence, emphasizing its nuclear arsenal’s defensive nature and its commitment to avoiding nuclear conflict. China is the prime example.

The inverse strategy to a narrative of minimum deterrence would be a narrative of maximum deterrence. In this approach, Russia, for example, emphasizes the offensive capabilities of its nuclear arsenal and its readiness to employ nuclear weapons in a wide range of scenarios. This narrative seeks to maximize the perceived threat posed by the Russian nuclear arsenal.

Unlike the minimum deterrence narrative, which emphasizes restraint and a defensive posture, the maximum deterrence narrative emphasizes assertiveness and a willingness to escalate to achieve strategic objectives. Such narratives can help reduce the risk of miscalculation and escalation by providing clarity about a state’s nuclear policy.

Shaping Perceptions of Capabilities

Narratives also play a crucial role in shaping perceptions of capabilities. States often use narratives to convey information about their nuclear arsenal’s size, sophistication, and survivability. These narratives can influence how other states perceive the balance of power and make strategic calculations. For example, a state that portrays its nuclear arsenal as modern and reliable may be seen as more credible and capable of deterring potential adversaries.

Additionally, the concept of secure second strike is fundamental. This capability refers to a state’s ability to respond to a nuclear attack with a devastating counterattack after absorbing a first strike. Second-strike retaliatory arsenals, which encompass a variety of delivery systems such as submarines, land-based missiles, and strategic bombers, are critical components.

Narratives surrounding second-strike retaliatory arsenals are designed to convey specific messages about a state’s nuclear capabilities. By highlighting the sophistication and survivability of their arsenals, states seek to deter potential adversaries by signaling that any attack would result in a devastating response.

Limitations of Narratives

Narratives in nuclear deterrence strategy are powerful tools, but they also have inherent limitations. One major limitation is the potential for misinterpretation or manipulation. Different states may interpret the same narrative in different ways, leading to misunderstandings and increased tensions. Moreover, narratives can be undermined by actions that contradict the message being conveyed. When China emphasizes its commitment to peaceful coexistence but then takes provocative actions, such as conducting aggressive military exercises near Taiwan, the credibility of its narrative is eroded. This is known as the credibility-action gap, where actions speak louder than words, undermining the narrative’s intended message.

When leaders openly talk about a taboo against the use of nuclear weapons, expressing a moral revulsion to using them even in extreme circumstances, it can inadvertently weaken the state’s deterrent posture. Adversaries may perceive this as a lack of resolve, believing that the state would be unwilling to use nuclear weapons even if its survival was at stake.

Importance of Narrative Control

In the context of nuclear deterrence, narrative control is not just a strategic advantage but a fundamental necessity. It is through narrative control that states can shape perceptions, manage crisis situations, and ultimately enhance their deterrence posture. This is important for four reasons.

First, narrative control allows states to shape how their nuclear capabilities are perceived by others. By crafting a narrative that emphasizes their resolve, states can deter potential adversaries by conveying a clear and credible message. This perception can influence how other states make strategic calculations and may deter them from taking aggressive actions.

Second, during a crisis, narrative control can be crucial in de-escalating tensions and preventing misunderstandings. A carefully crafted narrative can provide clarity about a state’s intentions and actions, helping to prevent misunderstandings that could lead to escalation. By shaping the narrative surrounding a nuclear incident, states can help manage crisis situations and reduce the risk of nuclear conflict.

Third, narrative control is essential for enhancing the credibility of deterrent threats. A state that successfully controls the narrative can convey a clear and credible message about its willingness and capability to use nuclear weapons, if necessary. This can enhance the credibility of its deterrent threats, making them more effective in deterring aggression.

Fourth, narrative control can help reduce the likelihood of nuclear conflict. By shaping perceptions, managing crisis situations, and enhancing credibility, states can deter potential adversaries and maintain peace and stability in the nuclear age.

Conclusion

With China and Russia growing increasingly assertive in the pursuit of their interests, nuclear deterrence is once again growing in its importance to the United States. The narratives surrounding nuclear weapons are pivotal in shaping perceptions of credibility, intentions, and capabilities. Crafting convincing narratives is thus crucial for President Biden and future presidents. As a free nation, the United States has never quite mastered the art of narrative creation because it can often seem antithetical to American values. It may seem too much like propaganda.

However, the time has come to reconsider this view. For the United States to effectively deter not only China and Russia, but also North Korea and a nascent nuclear Iran, an effective narrative is an important tool in the toolkit. This is particularly true as the American nuclear arsenal declines relative to those of China and Russia.

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

The Narrative of Nuclear Deterrence: Shaping Strategy in an Uncertain World was originally published on Global Security Review.