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STS-91 Mission Commander Charles J. Precourt holds his arms up and smiles during the final checkout of his flight suit in the Operations and Checkout (O&C) Building. The test is conducted prior to the crew walkout and transport to Launch Pad 39A. He is on his fourth space flight and third trip to Mir. Precourt is a colonel in the Air Force and has more than 6,500 hours of flight experience in more than 50 types of civil and military aircraft. He will have overall responsibility for the mission and will perform the final docking with the Russian space station. STS-91 is scheduled to be launched on June 2 with a launch window opening around 6:10 p.m. EDT. The mission will feature the ninth and final Shuttle docking with the Russian space station Mir, the first Mir docking for Discovery, the first on-orbit test of the Alpha Magnetic Spectrometer (AMS), and the first flight of the new Space Shuttle super lightweight external tank. Astronaut Andrew S. W. Thomas will be returning to Earth as a STS-91 crew member after living more than four months aboard Mir.