A total of 23 shields will eventually be installed onto the Service Module.[3] Expedition 5 EVA 2 Korzun Sergei Treshchev 26 August 2002 05:27 26 August 2002 10:48 5 hours, 21 minutes During Expedition Five's second spacewalk, Korzun and Treshchev installed a frame on the outside of the Zarya Module to house components for future spacewalk assembly tasks. They installed new material samples on a pair of Japanese Space Agency materials exposure experiments housed on the outside of Zvezda. Korzun and Treshchev also installed devices on Zvezda that will simplify the routing of tethers during future assembly spacewalks.