Employees at Rockwell International Corporation's Space Division in Downey, California look over a full scale mockup of the Space Shuttle orbiter. The mockup's payload bay doors are open, showing huge 15 feet diameter, 60 feet long bay in which up to 29,484 kilograms (65,000 lbs.) of varied cargo will be carried to Earth orbit. Engine bells are replicas of those that will be used with orbiter's three 2.092 million newton (470,000 lb.) thrust engines being developed for NASA's Marshall Space Flight Center by Rockwell's Rocketdyne Division. Space Division is developing orbiter and integrating Space Shuttle system under contract to NASA's Lyndon B. Johnson Space Center.