Maj. Anne McClain, one of two active-duty Army astronauts, stands inside a mock cupola, a multi-windowed observatory attached to the International Space Station, before she simulates bringing in a cargo load with the station's robotic arm during training at Johnson Space Center in Houston March 1, 2017. Cargo loads, which are launched every six months or so, normally deliver food, clothing and science experiments to the crew.

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Keywords: houston, nasa, space