What’s Your Why? Understanding Self-Determination Theory through a military lens

What’s your why? - Its a question that tends to emerge eventually in almost every profession, but particularly within the military. And if you have served, there is a strong chance you have either been asked that question directly or quietly wrestled with it yourself at some point.

At the time, however, most of us rarely gave entirely honest answers. We defaulted to the socially acceptable responses: the adrenaline, the chaos, the stories, the heli flights, the jumps, the weapon systems, the camaraderie.

And whilst none of those answers were necessarily false, they were often incomplete. In many ways, they sounded better than the truth because the truth itself was significantly harder to articulate.

The reality is that many people do not fully understand their own motivations whilst they are embedded within military culture. It is often only years later, once removed from the constant operational tempo, collective identity, and institutional mindset, that genuine reflection begins to occur.

This was certainly true in my own case. It was only after stepping away from that environment that I started thinking properly about why I had willingly pursued difficulty, hardship, pressure, and high-performance environments in the first place. More importantly, I began questioning why those environments felt meaningful in ways that ordinary civilian structures often did not.

What surprised me most was that the answer was not necessarily institutional at all. It was profoundly personal. That process of reflection eventually led me towards Self-Determination Theory (SDT), a psychological framework developed by Edward Deci and Richard Ryan, which seeks to explain human motivation, identity, and behavioural persistence.

And interestingly, few environments expose the principles of SDT more clearly than the military.

The problem with simplistic explanations of military motivation

From the outside, military motivation is often misunderstood. Civilian perspectives frequently reduce military service to simplistic explanations such as patriotism, discipline, obedience, aggression, adventure, or institutional loyalty.

Equally, military personnel themselves often contribute to this misunderstanding by providing surface-level explanations that are easier to communicate socially. After all, saying"I enjoy adrenaline” is considerably easier than explaining “I found meaning in environments that demanded competence, resilience, accountability, and collective trust.”

One sounds socially familiar. The other requires uncomfortable introspection. The problem is that simplistic explanations fail to account for an important question:

Why do some individuals voluntarily pursue environments that involve chronic discomfort, exhaustion, danger, scrutiny, and sacrifice when easier alternatives exist?

Because objectively speaking, military life is often physically difficult, psychologically demanding, socially restrictive, and emotionally exhausting. Sleep deprivation becomes normal. Discomfort becomes routine. Failure carries consequences. Weakness is exposed quickly. Standards matter. Performance matters. Trust matters. And yet many individuals remain deeply committed to these environments long after the novelty disappears. Why? Self-Determination Theory offers a compelling explanation.

Understanding Self-Determination Theory (SDT)

At its core, SDT argues that human beings are motivated by three fundamental psychological needs:

• Competence - the need to feel effective, capable, and able to master difficult tasks.

• Relatedness - the need to feel connected to others and part of something meaningful.

• Autonomy - the need to feel psychologically invested in one’s actions and choices.

When these needs are fulfilled, individuals experience deeper forms of intrinsic motivation, meaning, and psychological investment. Importantly, SDT distinguishes between external motivation and internalised motivation.

External motivation involves doing something for reward, punishment avoidance, status, or external validation. Internalised motivation is different. It occurs when behaviours become psychologically integrated into identity and self-concept.

This distinction becomes incredibly important when examining military environments. Because despite popular assumptions, many people are not motivated purely by external rewards. In fact, military life often demands sacrifices that far outweigh conventional incentives. The pay rarely compensates for the hardship. The hours are rarely rational. The personal sacrifices are often significant. And yet people remain. Not always because they have to. But because something deeper keeps them there.

Competence: The pursuit of capability

One of the strongest psychological drivers within military culture is competence. Military environments are brutally honest about capability. You either meet the standard or you do not. You either perform under pressure or you don't. There is very little ambiguity.

For many individuals, this becomes deeply meaningful because competence is no longer theoretical. It is tested continuously through physical hardship, psychological stress, operational pressure, and collective accountability.

This is particularly evident within elite military environments where standards become part of identity itself. The attraction is not necessarily suffering for its own sake. Rather, it is the pursuit of becoming capable within environments where capability genuinely matters. That distinction is important.

Many people spend their civilian lives operating within systems where performance can often be hidden behind bureaucracy, language, status, or superficial professionalism. Military environments strip much of that away. Pressure exposes reality quickly. And for some individuals, there is enormous psychological satisfaction in knowing they can function competently under conditions most people actively avoid.

Relatedness: The psychology of shared hardship

Equally important is relatedness. Military culture creates unusually intense social bonds because hardship accelerates trust and group cohesion. Shared suffering removes superficiality remarkably quickly.

When individuals endure exhaustion, fear, uncertainty, discomfort, and pressure together, relationships often develop differently from those formed in ordinary social environments. This is one reason many veterans struggle to articulate what they miss after leaving service. It is rarely just the job itself.

Often, it is the depth of trust, accountability, and belonging that existed within that environment. Again, this aligns strongly with SDT. Human beings are fundamentally relational creatures. We seek belonging, meaning, and connection. Military environments frequently provide these needs at unusually high intensity.

The autonomy paradox

Perhaps the most interesting aspect of SDT within military settings is autonomy. At first glance, the military appears fundamentally incompatible with autonomy. After all, military institutions are hierarchical, restrictive, and heavily regulated. But SDT defines autonomy differently. Autonomy is not simply freedom. It is psychological ownership. And paradoxically, many military personnel experience strong autonomy precisely because they voluntarily commit themselves to difficult standards and identities.

The environment may impose external structure, but the individual internally endorses the challenge. This helps explain why many people struggle to articulate their motivations clearly.

Because eventually the motivation ceases to feel transactional. It becomes identity-based. You stop merely performing a role. You become the kind of person who willingly does difficult things.

Understanding the “Why” afterwards

Perhaps the most important insight from SDT is that people do not always fully understand their motivations whilst living inside them. Often, reflection only occurs retrospectively. Only after leaving the environment do individuals begin recognising what they were actually pursuing, be that competence, meaning, belonging, identity, challenge, purpose or self-respect. And importantly, those motivations are often far more personal than institutional. That realisation can be uncomfortable because it challenges simplistic narratives about military identity. But psychologically, it makes sense. Many people were not simply serving an organisation. They were pursuing a particular version of themselves.

Final reflections

Self-Determination Theory provides a powerful framework for understanding why people voluntarily pursue military environments despite the hardship, sacrifice, and pressure involved.

It demonstrates that military motivation is often far more psychologically sophisticated than outsiders assume.

For many individuals, the attraction is not merely excitement or adventure. It is the pursuit of competence. The search for belonging. The desire for meaning. The internalisation of identity through challenge. And perhaps that is why the question: “Why did you do it?” often feels surprisingly difficult to answer.

Because sometimes you do not fully understand your own “why” until long after you leave the environment that shaped it.