S94-40061 (23 June 1994) --- Secured in a collapsible seat on the middeck of a Shuttle trainer, astronaut Ellen Ochoa, payload commander, participates in a rehearsal of procedures to be followed during launch and entry phases of the scheduled November flight of STS-66. This rehearsal, held in the crew compartment trainer of the Johnson Space Center's (JSC) Shuttle Mockup and Integration Laboratory, was followed by a training session on emergency egress procedures. In November Ochoa will join four other NASA astronauts and a European mission specialist for a week and a half aboard the Space Shuttle Atlantis in Earth-orbit in support of the Atmospheric Laboratory for Applications and Science (ATLAS-3).