The Voices Behind Artemis II’s Return to Earth

As Artemis II made its final descent toward Earth, completing the farthest journey into space in human history, the astronauts heard a single, steady voice guiding them home, a calm presence during one of the mission's most critical moments.

That voice came from a capsule communicator, or CAPCOM, inside NASA's Mission Control Center in Houston, where KBR played a critical role in mission operations, system monitoring and crew safety.

"A single voice makes it easier for the crew to know exactly where their information is coming from," said KBR team member and capsule communicator Tess Caswell. "It helps ensure everything they hear is accurate, consistent and focused on what matters most in that moment."

That clarity is essential throughout a human spaceflight mission, from launch through splashdown, when conditions can change quickly and decisions must be made in seconds.

One Voice, Backed by Many

Caswell served as the Artemis II lead CAPCOM, responsible for preparing the team of eight CAPCOMs who supported the astronauts during the mission's 10-day journey. She will continue serving as lead CAPCOM for future Artemis missions.

During Artemis II, she helped train the CAPCOMs, reviewed crew procedures and coordinated staffing to ensure continuous 24/7 communication coverage. She also worked several shifts on console in Mission Control, speaking directly with the crew, troubleshooting in-space email issues and reviewing information before it was sent to the astronauts.

Different CAPCOMs supported the mission at different stages, from launch to the journey around the moon and the return to Earth.

At each stage, a designated CAPCOM served as the primary voice between the crew and the flight control team. This deliberate framework avoids confusion and maintains precision. That single communicator was responsible for gathering input from the entire flight control team and delivering it clearly and concisely to the astronauts. For more complex phases, such as launch and re-entry, specifically trained CAPCOMs were assigned to ensure the crew received precise guidance during those most critical moments.

KBR team member and CAPCOM Sandy Moore supported those operations, working alongside the CAPCOM in Mission Control. She helped monitor and distill incoming information from engineers and flight controllers, assisting the CAPCOM in maintaining a clear, steady flow of communication to the astronauts.

"It's both humbling and rewarding," Moore said. "You're supporting the voice the crew relies on, and that carries a lot of weight."

Turning Complexity into Clarity

Mission Control processed a constant stream of technical data throughout the historic flight, including details about when the spacecraft's engines were fired, weather conditions at the landing site and other factors that might affect a safe return to Earth.

Communication is key. If a problem occurs, CAPCOMs must quickly identify the most important information coming from the flight control team and relay it precisely to the astronauts.

"Our job is really to listen for what matters most and pass that along to the crew," Caswell said. "If there's something they need to do to stay safe, we make sure that message comes through clearly."

Caswell's most memorable shift came during the final phase of the lunar flyby, when the crew completed scientific observations and shared their experience in real time.

She listened as astronaut Victor Glover described, in awe, seeing impact flashes - brief bursts of light caused by space rocks striking the moon's shadowed surface.

"We just went sci-fi up here," Caswell recalled Glover saying.

The shift also included a call from the President, who said, "Today, you've made history and made all of America really proud ... there's nothing like it."

For Caswell, the experience underscored the significance of the mission.

"Though my role in that moment was small, it was an honor to be part of something so meaningful," Caswell said.

The first images of the moon and Earth arrived moments later in Mission Control, drawing a crowd of engineers and flight controllers eager to see them.

Trust and Training

CAPCOMs trained extensively in simulations designed to prepare them for a wide range of scenarios.

After each simulation, the team conducted detailed debriefs to review performance and refine their approach. Training covered spacecraft systems, mission timelines and crew operations under expected conditions and emergency situations.

Trust mattered just as much as training.

CAPCOMs spent time with the astronauts before the launch, building relationships that allowed them to communicate effectively and advocate for the crew during the mission.

"When both sides of the job come together, it really reminds you why this work matters," Caswell said.

When Orion splashed down in the Pacific Ocean on April 10 and the astronauts returned safely to Earth, that steady connection held until the very end.

"It was an honor to play even a small part in bringing a crew home safely and in something that inspires people around the world," Caswell said. "It's incredibly meaningful."