Leadership

From SEAL to Space: Becoming NASA’s Top Astronaut with Chris Cassidy

April 23, 2025

From SEAL to Space: Becoming NASA’s Top Astronaut with Chris Cassidy

Chris Cassidy

President & CEO of the National Medal of Honor Museum

On a recent Walker Webcast, I had the extraordinary honor of hosting Captain Chris Cassidy—Navy SEAL, NASA astronaut, and now CEO of the Medal of Honor Museum and Foundation.

Chris’s life reads like an adventure novel: SEAL deployments, three spaceflights, a year in orbit, and now, the stewardship of America’s most sacred military legacy. Behind all those accolades lies a humble, disciplined leader whose story offers invaluable lessons in courage, preparation, and service.

Humble beginnings and unexpected paths

Chris grew up in a small town in Maine, where he learned the value of hard work from parents who ran a local restaurant. His trajectory wasn’t obvious. As he put it, he wasn’t the standout student or athlete expected to light the world on fire. But the seeds of discipline and resilience were there, cultivated in the early mornings and hard-earned achievements that would follow.

A serendipitous visit to the Naval Academy set him on the military path. But it was his exposure to SEAL mentors at Annapolis that sparked a deeper ambition. He was drawn to their quiet intensity, their squared-away presence—and eventually, he pursued and completed the grueling BUD/S training.

His mindset? Not wanting to let his teammates down. That sense of team-first leadership became a defining trait throughout his career.

Leadership forged in the harshest conditions

As a SEAL deployed to Afghanistan, Chris led with resolve, shaped by the unspoken accountability of carrying literal and figurative weight with your team. In training, failure wasn’t an option because someone else would pay the price.

That same ethos translated to space. Chris became one of NASA’s top spacewalkers and eventually was named Chief Astronaut—a role he initially doubted he was ready for, until he reflected on the sum of his life’s experiences. Each chapter, from underwater ops to orbital missions, added a new arrow to his quiver of leadership.

Fear, risk, and the art of preparation

Whether swimming off a submarine in the dead of night or launching into orbit strapped to a rocket, Chris learned to manage fear not by eliminating risk, but by reducing uncertainty. He likened it to a kindergartener’s first day of school; terror transforms into comfort through exposure and preparation.

NASA, like SEAL teams, thrives on planning for the "next worst failure." This mentality enabled him to approach high-stakes missions with calm clarity.

Astronaut insights: From the cupola to the treadmill

Chris shared some physical and mental adjustments astronauts make in space, including how a daily two-hour exercise regimen combats bone loss. Using innovative equipment—from weightless treadmills to seatless bikes—astronauts maintain fitness not for looks, but for survival.

Space travel also taught him something surprisingly human: the need for solitude. In orbit, personal quarters the size of a refrigerator offer rare privacy. While camaraderie is essential, he relished the calm of having the International Space Station nearly to himself during parts of his six-month missions.

Bridging conflict through shared missions

Chris's perspective on U.S.-Russia collaboration in space was especially timely. He spent years training outside Moscow and served with Russian cosmonauts during periods of global tension. Despite geopolitical friction, the ISS remains a model of international cooperation grounded in mutual trust and shared objectives.

A new mission on Earth

Today, Chris leads the Medal of Honor Museum and Foundation in Arlington, Texas—a $285 million initiative to honor the fewer than 4,000 recipients of the nation’s highest military decoration. He joined the project because he saw an opportunity to build something of national significance, and because, like so many of his past roles, it’s about service.

The museum is as innovative as it is meaningful, with interactive exhibits and immersive storytelling designed to bring valor and sacrifice to life for generations of Americans.

Want more?

As host of the Walker Webcast, I have the privilege to converse with fascinating people like Chris Cassidy every week. Subscribe to the Walker Webcast to see our upcoming guests.

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