Astronaut John Glenn during training exercise in Mercury Procedures Trainer
Close-up view of Mercury Astronaut John H. Glenn Jr. as he runs through a training exercise in the Mercury Procedures Trainer in use at Space Task Group, Langley Field, Virginia. This Link-type spacecraft simulator permits the practice of both normal and emergency modes of systems operations. Glenn is in the Mercury pressure suit and is wearing his helmet, just as he would if the flight were real.
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