STS-119 Mission Specialist Richard Arnold practices using the camera to be used on the mission.

In the Orbiter Processing Facility at NASA's Kennedy Space Center in Florida, STS-119 Mission Specialist Richard Arnold (right) practices using the camera to be used on the mission. Looking on is Mission Specialist Steve Swanson. The crew is at Kennedy for a Crew Equipment Interface Test that provides experience handling tools, equipment and hardware they will use on the mission. On the STS-119 mission, space shuttle Discovery will carry the S6 truss segment to complete the 361-foot-long backbone of the International Space Station. The truss includes the fourth pair of solar array wings and electronics that convert sunlight to power for the orbiting laboratory. Discovery is targeted for launch on Feb. 12, 2009. Photo credit: NASA/Kim Shiflett