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A flawless countdown culminates with an on-time liftoff as the Space Shuttle Endeavour lights up the morning sky. Endeavour was launched on Mission STS-77 from Pad 39B at 6:30:00 a.m. EDT, May 19. The fourth Shuttle mission of 1996 is devoted to the continuing effort to help open the commercial space frontier. Heading up the six-member crew is Commander John H. Casper. Curtis L. Brown Jr. is the pilot and there are four mission specialists on board: Daniel W. Bursch, Mario Runco Jr., Andrew S. W. Thomas and Marc Garneau, who represents the Canadian Space Agency. During the approximately 10-day mission, the astronauts will perform a variety of payload activities, including microgravity research aboard the SPACEHAB-4 module, deployment and retrieval of the Spartan 207 carrying the Inflatable Antenna Experiment (IAE) and deployment and rendezvous with the Passive Aerodynamically-Stabilized Magnetically-Damped Satellite (PAMS).