SEAL completes first mission in space.(This Just In)(U.S. Navy SEAL Chris Cassidy)(Brief article)

A U.S. Navy SEAL performed his first walk in space during his recent maintenance mission aboard the International Space Station (ISS).

Cmdr. Chris Cassidy and astronaut David Wolf replaced two of the six original batteries on the ISS and removed multilayer insulation from the Japanese "Kibo" laboratory module to prepare payloads for transfer to an exposed outside section. This walk was the first of three scheduled for Cassidy during this mission. Cassidy and other astronauts with Space Transport System (STS) 127 aboard the shuttle Endeavor blasted off from Kennedy Space Center in Florida.

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Endeavor's crew tasks include swapping crew …