JSC2007-E-18132 (9 April 2007) --- Attired in training versions of their shuttle launch and entry suits, astronauts Pamela A. Melroy (left), STS-120 commander; George D. Zamka, pilot; Douglas H. Wheelock and Scott E. Parazynski, both mission specialists, await the start of a training session in the Space Vehicle Mockup Facility at Johnson Space Center.