Image Cache: Astronaut John Glen was one of the Mercury Seven, the first Americans trained for spaceflight. Before Glen became the first American to orbit the Earth in his Friendship 7 mission on 20 February 1962, he went through a lot of training.
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In the photograph above, he practices for the Mercury mission in a spacecraft simulator, staring determinedly at the ceiling while a NASA researcher tracks his every move. Below, he practices exercises in the Mercury Procedures Trainer at the Space Task Group, Langley Field, Virginia. The trainer was used to practice normal and emergency modes of systems operations.