Stock Photo - NASA astronaut Chris Cassidy, Expedition 3536 flight engineer, prepares for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL) near NASA's Johnson Space Center. Cassidy is wearing a liquid cooling and ventilation garment that complements the Extravehicular Mobility Unit (EMU) spacesuit. A crew instructor assisted Cassidy.

Stock Photo: NASA astronaut Chris Cassidy, Expedition 3536 flight engineer, prepares for a spacewalk training session in the waters of the Neutral Buoyancy Laboratory (NBL).

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