The Expedition 4 crew launched on 5 December 2001, aboard STS-108 and docked with the International Space Station on 7 December 2001. During a 6½ month stay aboard the Space Station, the crew of three (two American astronauts and one Russian cosmonaut) performed flight tests of the station hardware, conducted internal and external maintenance tasks, and developed the capability of the station to support the addition of science experiments. The crew spent 196 days in space establishing a U.S. space flight endurance record for Carl Walz and crewmate Dan Bursch. Wearing the Russian Orlan space suit, Walz logged 11 hours and 52 minutes of EVA time in two separate spacewalks. The Expedition 4 crew returned to Earth aboard STS-111, with Endeavour landing at Edwards Air Force Base, California, on 19 June 2002.