STS-131 crew members during UNDOCK MAL Timeline training.

JSC2010-E-006700 (5 Jan. 2010) --- NASA astronauts James P. Dutton Jr., STS-131 pilot; Dorothy Metcalf-Lindenburger (center) and Japan Aerospace Exploration Agency (JAXA) astronaut Naoko Yamazaki, both mission specialists, participate in an undocking timeline training session in the Guidance and Navigation Simulator in the Mission Simulation Development Facility at NASA's Johnson Space Center.