![John Glenn in the Mercury Procedures Trainer, a spacecraft simulator](https://www.nasa.gov/wp-content/uploads/2023/03/9457842545_546c282d7b_o.jpg)
John Glenn in the Mercury Procedures Trainer
John H. Glenn, one of the Mercury Seven Astronauts, runs through a training exercise in the Mercury Procedures Trainer at the Space Task Group, Langley Field, Virginia. This Link-type spacecraft simulator allowed the astronaut the practice of both normal and emergency modes of systems operations.
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https://www.nasa.gov/image-detail/john-glenn-mercury-procedures-trainer/
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