NASA Astronaut Jonny Kim Completes Nearly a Decade of Service, Returns to U.S. Navy Duty

After nearly ten years of distinguished service at NASA, including an eight-month scientific mission aboard the International Space Station, Lieutenant Commander Jonny Kim concluded his time with the agency on Thursday, August 27, 2026. He will continue serving on active duty in the U.S. Navy, focusing on naval aviation training to complete the remainder of his military career.

Kim, a former Navy SEAL, physician, dual-designated naval aviator and flight surgeon, and NASA astronaut, represents one of the most multifaceted careers in modern American public service. Born in Los Angeles on February 5, 1984, to Korean-American immigrant parents, he enlisted in the U.S. Navy shortly after high school in 2002. He trained as a hospital corpsman, completed Basic Underwater Demolition/SEAL (BUD/S) training, and joined SEAL Team Three. During his military service, he participated in more than 100 combat operations, primarily in Iraq, where he served in medical and operational roles. His military service earned him the Silver Star, the Bronze Star with Combat “V,” and multiple additional commendations.

Following his special operations service, Kim pursued higher education while remaining in the Navy. He earned a bachelor’s degree in mathematics, summa cum laude, from the University of San Diego through an enlisted-to-officer program. He then obtained a Doctor of Medicine degree from Harvard Medical School and completed his internship at Massachusetts General Hospital and Brigham and Women’s Hospital in Boston. Later, he achieved the rare dual designation of naval aviator and flight surgeon after completing flight training at Naval Air Stations Corpus Christi and Whiting Field, along with aerospace medical training at the Naval Aerospace Medical Institute in Pensacola.

Selected as a NASA astronaut in 2017 as part of Astronaut Group 22, Kim completed two years of rigorous astronaut candidate training covering space station systems, Russian language, robotics, T-38 jet operations, geology, survival skills, and spacewalk preparation. He supported station operations as a capsule communicator (CapCom) in Mission Control at NASA’s Johnson Space Center, contributed to Artemis program development, led the astronaut crew operations branch, and served as increment lead for Expedition 65.

Historic Spaceflight Mission

Kim launched to the International Space Station on April 8, 2025, aboard the Roscosmos Soyuz MS-27 spacecraft alongside cosmonauts Sergey Ryzhikov and Alexey Zubritsky. As a flight engineer for Expeditions 72 and 73, he spent 245 days in orbit—completing 3,920 revolutions of Earth and traveling nearly 104 million miles. He conducted research across technology development, Earth science, biology, and human health studies supporting future space exploration.

Notable contributions included serving as U.S. Operating Segment lead for the second half of Expedition 73, overseeing operations across the station’s international modules. During his time aboard, the station achieved a historic milestone: every available docking port was occupied simultaneously for the first time in 25 years. Kim also operated the Canadarm2 robotic arm to capture Northrop Grumman’s Cygnus XL spacecraft on its first flight, securing approximately 11,000 pounds of supplies. The crew returned safely to Earth with a parachute-assisted landing in Kazakhstan on December 9, 2025.

Tributes from NASA Leadership

NASA Administrator Jared Isaacman stated: “Jonny Kim represents the very best of NASA, a person who continually pushed the boundaries of exploration while inspiring countless others. His contributions aboard the International Space Station advanced critical science that will shape NASA’s future missions for decades to come. We are grateful for his dedication to our nation and to the pursuit of knowledge, and we wish him success as he continues his service in the U.S. Navy.”

Vanessa Wyche, director of NASA’s Johnson Space Center, added: “Jonny has been an integral part of the agency, and his immeasurable impact will be felt for generations to come. From advancing groundbreaking science to inspiring the next generation, Jonny has been an incredible source of inspiration to our nation. His exceptional talent, determination, and grit will leave a lasting legacy at NASA.”

Scott Tingle, chief of the Astronaut Office, noted: “Jonny approached every assignment with humility, precision, and steadfast commitment to the mission. His combination of medical training, operational experience, and engineering insight strengthened our team and contributed to advancements in exploration and space station operations.”

Kim’s Own Reflection

Reflecting on his NASA chapter, Kim said: “Contributing to space exploration and serving NASA has been the honor of a lifetime. Throughout my career, I’ve learned that beyond the missions, the training, and the hardware, success always comes down to the people. They are our greatest asset, and leading with love and empathy is how we achieve the impossible. I look forward to carrying my commitment to service, my enduring love for space and technology, and the hard-earned lessons of this past decade into my next chapter to make a meaningful impact on humanity’s future.”

Kim’s path—from combat operations to the operating room, from jet cockpits to the International Space Station—embodies disciplined excellence, lifelong learning, and public service. As he continues his service in the U.S. Navy, his career provides an example of dedication, education, and perseverance.

This article is based primarily on official NASA releases and publicly available information about Jonny Kim’s career and spaceflight. Details that could not be independently confirmed have been omitted or presented more cautiously.