Mission Specialist Heidemarie Stefanyshyn-Piper gives one last tug on the strap of her launch suit.

STS-115 Mission Specialist Heidemarie Stefanyshyn-Piper gives one last tug on the strap of her launch suit. Piper is making her first flight on a shuttle. She and other crew members are checking their launch suits and apparatus before the launch on Aug. 27. Mission STS-115 is scheduled to lift off about 4:30 p.m. Aug. 27 on Space Shuttle Atlantis. The crew will deliver and install the P3/P4 segment to the port side of the integrated truss system on the International Space Station. The truss includes a new set of photovoltaic solar arrays. When unfurled to their full length of 240 feet, the arrays will provide additional power for the station in preparation for the delivery of international science modules over the next two years. The mission is expected to last 11 days and includes three scheduled spacewalks. Photo credit: NASA/Kim Shiflett