The U.S. Army is launching into space — once again — by way of Col. Frank Rubio, who will be part of the 2027 Artemis III mission, NASA announced Tuesday.

The astronaut will be part of a four-man crew that will tackle a host of difficult tests within Earth’s orbit in preparation for NASA’s 2028 Artemis IV flight, which will be the first crewed mission to the moon’s South Pole.

Rubio’s mission is slated to serve as a proving ground for future lunar landings, as the team will evaluate how the spacecraft navigates toward and docks with commercial landing systems developed by Blue Origin and SpaceX.

“My Army training has been an integral part of the experiences that have enabled me to be ready for this mission,” Rubio, a former Black Hawk pilot-turned-flight surgeon, said in a Tuesday statement released by the Army.

“Serving taught me to lead under pressure, how to stay calm when the stakes are highest, and how to put the mission and the people beside you above yourself,” he added.

Rubio’s selection as a mission specialist for Artemis III comes after a record-setting 371-day mission aboard the International Space Station from September 2022 to September 2023, where he set the American record for the longest single spaceflight. The unexpected yearlong mission saw Rubio complete 5,963 orbits around Earth, travel over 157 million miles and complete three spacewalks that amounted to 21 hours and 24 minutes in total.

His previous journey was only meant to last six months, but a spacecraft coolant leak prolonged the mission.

Before he began eschewing gravity in pursuit of outer space, Rubio served nearly 20 years as an aviator and then physician. He graduated from the United States Military Academy in 1998 and logged over flight 1,100 hours — more than 600 in combat during deployments to Bosnia, Afghanistan and Iraq — before beginning medical school and training as a family physician and flight surgeon.

At the time of Rubio’s NASA selection, he was a battalion surgeon for the 3rd Battalion of the 10th Special Forces Group (Airborne) in Colorado.

Rubio is one of three Artemis III crew members with military backgrounds. Andre Douglas, who will serve as a mission specialist during the flight, graduated from the Coast Guard Academy before serving as a guardsman. Randy Bresnik, the crew’s commander, retired as a colonel in the Marine Corps.

Bob Hines, who was selected as backup crew member, is a colonel in the Air Force.

Nineteen Army astronauts have taken part in NASA’s space missions, but Rubio and Col. Anne McClain are the Army’s only active duty astronauts, according to the service. Chief Warrant Officer 3 Joseph Bailey, also on active duty, is an astronaut candidate and began his initial training in September 2025.