JSC2010-E-195512 (3 Dec. 2010) --- Crew instructors Patrick Jones (left), Robert (Rob) Tomaro and Bob Behrendsen brief STS-135 crew members during an emergency egress training session in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center. Seated are NASA astronauts Chris Ferguson (right), commander; Doug Hurley (left), pilot; Sandy Magnus and Rex Walheim, both mission specialists. STS-135 is planned to be the final mission of the space shuttle program. Photo credit: NASA or National Aeronautics and Space Administration