NASA Career
Arnold was selected as a Mission Specialist-Educator by NASA in May 2004. In February 2006 he completed Astronaut Candidate Training that included scientific and technical briefings, intensive instruction in Shuttle and International Space Station systems, physiological training, T-38 flight training, and water and wilderness survival training. Upon completion of his training, Arnold was assigned to the Hardware Integration Team in the Space Station Branch working on technical issues with JAXA hardware. He worked on various technical assignments until he was assigned to the STS-119 spaceflight. Arnold participated in two spacewalks during the mission.
In August 2007, Arnold served as an aquanaut during the NEEMO 13 project, an exploration research mission held in Aquarius, the world's only undersea research laboratory. On September 19, 2011, NASA announced that Arnold would participate in the NEEMO 15 mission in October 2011 from the DeepWorker submersible. The DeepWorker is a small submarine used as an underwater stand-in for the Space Exploration Vehicle, which might someday be used to explore the surface of an asteroid.
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