What requirement remains mandatory for all ISS crew members, regardless of whether they ascend using the Soyuz hardware?

Answer

Specialized training on the Soyuz vehicle, ensuring they know how to operate and undock the legacy capsule in an emergency.

A fundamental safety protocol established for the International Space Station mandates cross-training for all crew members, irrespective of their primary mode of transportation to orbit. Because the Soyuz capsule represents a proven, long-standing hardware component of the station infrastructure, all astronauts and cosmonauts must undergo specialized training focused on operating this vehicle. This ensures that in any emergency scenario requiring undocking or independent operation of the legacy capsule, every crew member possesses the necessary skills to handle the situation effectively.

What requirement remains mandatory for all ISS crew members, regardless of whether they ascend using the Soyuz hardware?

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