STS-119 Mission Specialist John Phillips is helped by the Closeout Crew to put on his harness.

In the White Room on Launch Pad 39A at NASA's Kennedy Space Center in Florida, STS-119 Mission Specialist John Phillips (center) is helped by the Closeout Crew to put on his harness. Phillips will join Commander Lee Archambault (background right) and other crew members to enter space shuttle Discovery to conduct a simulated launch countdown. The astronauts are at Kennedy to prepare for launch through Terminal Countdown Demonstration Test activities. The TCDT includes equipment familiarization and emergency egress training. Discovery is targeted to launch on the STS-119 mission Feb. 12. During the 14-day mission, the crew will install the S6 truss segment and solar arrays to the starboard side of the International Space Station, completing the station's truss, or backbone. Photo credit: NASA/Sandra Joseph, Kevin O'Connell, Tom Farrar