ISS space walk. US astronaut Jeffrey Williams (born 1958) during a session of extravehicular activity (EVA, a space walk), at the International Space Station (ISS). Williams carried out this EVA during his 6-month stay on the ISS as part of the 2-man Expedition 13 Crew (March-September 2006). During this EVA, he and his colleague carried out repairs and upgrades to the ISS. Photographed on 3 August 2006.