Take a listen to Jocko's Podcast with Johnny Kim, the Seal/Doctor/Astronaut.
Jocko Podcast 221: Jonny Kim. Navy SEAL, Doctor, Astronaut. The Unimaginable Path.
This is from his Bio on NASA's website:
"LCDR Kim enlisted in the Navy as a Seaman recruit after graduating high school in 2002. After completion of Hospital Corpsman “A” school training, he reported to Basic Underwater Demolition/SEAL (BUD/S) training in Coronado, CA. After completing his training at Naval Special Warfare, Kim reported to John F. Kennedy Special Warfare Center and School in Fort Bragg, NC for the Special Operations Combat Medic Course. He was assigned as a Special Warfare Operator to SEAL Team THREE Charlie Platoon in San Diego, California and obtained various qualifications including Military Freefall Parachutist, Combatant Diver (closed circuit rebreather), Naval Special Warfare Special Reconnaissance Scout and Sniper, and Advanced Special Operations Techniques. Kim served as a Special Operations Combat Medic, sniper, navigator and point man on more than 100 combat operations spanning two deployments to the Middle East including Ramadi and Sadr City, Iraq. He was commissioned as a naval officer through the Navy’s enlisted-to-officer commissioning program, Seaman to Admiral-21, following graduation from the University of San Diego in 2012. Kim obtained his medical degree from Harvard Medical School and completed his internship with Harvard Affiliated Emergency Medicine Residency at Massachusetts General Hospital and Brigham and Women’s Hospital."