Fossum and Sellers on the OBSS during EVA1 on STS-121 / Expedition 13 joint operations

S121-E-06043 (8 July 2006) --- Astronauts Piers J. Sellers (red stripes) and Michael E. Fossum, STS-121 mission specialists, work in tandem on the shuttle's Remote Manipulator System/Orbiter Boom Sensor System (RMS/OBSS) during the mission's first scheduled session of extravehicular activity (EVA).