S118-E-08015 (15 Aug. 2007) --- Astronauts Rick Mastracchio (right), STS-118 mission specialist; and Clay Anderson (anchored to the foot restraint on the Canadarm2), Expedition 15 flight engineer, participate in the mission's third planned session of extravehicular activity (EVA) as construction and maintenance continue on the International Space Station. During the 5-hour, 28-minute spacewalk, Mastracchio and Anderson relocated the S-Band Antenna Sub-Assembly from Port 6 (P6) to Port 1 (P1) truss, installed a new transponder on P1 and retrieved the P6 transponder.