What graced the left shoulder of an Apollo astronaut's training suit?

The U.S. Flag graced the left shoulder of an Apollo astronaut’s training suit. NASA used the flag as a prominent national emblem on astronaut garments, including the suits worn during training for Apollo missions.

Apollo astronauts trained extensively in pressure suits and related equipment before attempting launch, lunar operations, or atmospheric reentry. Training suits helped crews practice movement, procedures, communications, and emergency scenarios while wearing bulky equipment.

The shoulder flag is sometimes confused with mission patches. Mission patches identified a specific flight and were commonly placed on the chest or other parts of the suit, while the U.S. flag identified the astronauts’ national program. Apollo astronauts also wore American flags on their lunar spacesuits, although the flag’s appearance and placement varied by garment and mission.