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KENNEDY SPACE CENTER, FLA. - STS-115 Mission Specialist Steven MacLean takes his turn driving the M-113 armored personnel carrier. STS-115 Mission Specialist Steven MacLean takes his turn driving the M-113 armored personnel carrier. Passengers on the carrier are Mission Specialists Daniel Burbank and Heidemarie Stefanyshyn-Piper, Pilot Christopher Ferguson and Capt. George Hoggard, who is astronaut rescue team leader. MacLean represents the Canadian Space Agency. The STS-115 crew are at NASA's Kennedy Space Center for Terminal Countdown Demonstration Test activities such as the M-113 training. They will also practice emergency egress from the launch pad and take part in a simulated launch countdown. Liftoff of mission STS-115 aboard Space Shuttle Atlantis is scheduled in a window beginning Aug. 27. Photo credit: NASA/Cory Huston