He was born January 4, 1970 in Salem, Massachusetts but considers York, Maine, to be his hometown. He has earned a B.S., Mathematics, U.S. Naval Academy, 1993. M.S., Ocean Engineering, Massachusetts Institute of Technology, 2000. Cassidye spent ten years as a member of the U.S. Navy SEAL Teams. He served as Ground Assault Force Commander for international and U.S. only combat missions in Afghanistan. Led two months of non-compliant ship-boardings in the Northern Arabian Gulf. From 2006 to 2008 he served as CAPCOM in Mission Control. In July 2009, Cassidy completed his first space flight and logged more than 376 hours in space, including 18 hours and 5 minutes of EVA (extra-vehicular activity) in three spacewalks.
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