Astronaut Joseph R. Tanner

Astronaut Joseph R. Tanner, STS-115 mission specialist, waves toward the digital still camera of his spacewalk colleague, astronaut Heidemarie M. Stefanyshyn-Piper as the two share extravehicular activity (EVA) duties during the first of three scheduled spacewalks. The STS-115 astronauts and the Expedition 13 crewmembers are joining efforts this week to resume construction of the International Space Station.