(07/01/1997) --- STS-94 Mission Commander James D. Halsell, Jr., prepares to enter the Space Shuttle Columbia at Launch Pad 39A in preparation for launch. Halsell is on his fourth space flight, having served as commander of STS-83 and pilot of both STS-74 and STS-65. He is a lieutenant colonel in the Air Force and a former SR-71 Blackbird test pilot and holds master’s degrees in management and space operations. Halsell will have responsibility for the success of the mission and will operate and maintain Columbia during the Red, or second shift. He will also assist with a materials science experiment and a protein crystal growth payload during the 16-day mission. Halsell and six fellow crew members will lift off during a launch window that opens at 1:50 p.m. EDT, July 1. The launch window will open 47 minutes early to improve the opportunity to lift off before Florida summer rain showers reach the space center