— A towering propellant tank and its rocket engine now stand on display at Los Angeles Air Force Base as a testament to its service to both the United States' military and civilian space missions.

The Centaur III upper stage tank and RL-10 engine exhibit was dedicated last month outside the headquarters for Space Systems Command, the U.S. Space Force's division for acquiring and delivering space capabilities. The liquid hydrogen-fueled Centaur, in its various configurations, has been used in almost 300 launches of Earth orbit and interplanetary spacecraft since 1962.

"The Centaur is deeply rooted in our history," said Col. Michelle Idle, deputy commander of Space Systems Command, addressing the audience of more than 100 who attended the Oct. 18 ribbon-cutting ceremony. "It has put many of our capabilities up to orbit time and time again, the Centaur has delivered."

The tank and engine were donated by United Launch Alliance (ULA), which provides satellite launch services for the Department of Defense. The hardware was previously used for various testing and research purposes over the course of the Atlas II and Atlas V rocket programs.

The now-retired hardware was delivered by truck from the Mojave desert to the base in El Segundo, California on Oct. 5. The exhibit is a result of a multi-year effort by the Space Force, the Air Force, industry partners and the Space Systems Command's Heritage Center, which supports the command's public history and educational activities.

"The Centaur, the RL10, have been pretty much hand-in-glove with [what's now] Space Force since the '60s, getting critical satellites to orbit and still is there, helping us do our job," said retired Air Force Maj. Gen. Thomas Taverney, chairman of the Heritage Center's foundation, according to a Space Force release issued on Monday (Nov. 4). "Centaur's not only been a long-living system that has continuously been updated with new technology, but it's also been a pretty darn reliable system that's operated with a high success rate."

The Centaur was developed by a partnership between the Defense Department, NASA and industry. In addition to launching classified payloads for the military and intelligence agencies, the Centaur has flown on Titan and Atlas family rockets to send probes to study the Sun and the planets. A version of the Centaur was developed but never flown on the space shuttle.

In its most recent configuration, the dual-engine Centaur V flies with ULA's new Vulcan heavy-lift launch vehicle.

"Centaur was the first cryogenic upper stage featuring hydrogen and liquid oxygen, so that we could fly longer, more intense and higher-energy missions," said Marcus Nichols, a former Air Force officer who served at Los Angeles AFB and who currently works as ULA's senior manager in southern California. "We've evolved that over time to make it the most capable high-energy upper stage in the business, servicing national defense and powering missions to every planet in the solar system — and Pluto."

The Centaur III and RL-10 exhibit is located beyond the security perimeter of Los Angeles Air Force Base, restricting public access. Other Centaur stages on display include a Centaur II at the Wings Over the Rockies Air & Space Museum in Denver and Centaur G Prime (or Shuttle-Centaur) at NASA's Glenn Research Center in Cleveland.

"The Centaur, also known as America's workhorse in space, services as an engineering marvel, representing decades of innovation and achievement in aerospace technology," said Lt. Col. Sean Granier, 61st Civil Engineer and Logistics Squadron commander and host of the dedication ceremony. "Space is not just the final frontier; it is a realm where our dreams take flight and where teamwork, across disciplines, leads to ground-breaking discoveries."