(03/24/1975) -- U.S. astronauts Thomas Stafford (left), Vance Brand (center) and Donald Slayton pose in front of their Apollo Soyuz Test Project space vehicle during rollout ceremonies at KSC. The 224-foot-tall Saturn IB launch vehicle began its five-mile journey from the Vehicle Assembly Building to Complex 39's Pad at 8 a.m. The ASTP launch is scheduled for 3:50 p.m. EDT on July 15. During the mission the U.S. Apollo spacecraft will rendezvous and dock with the Soviet Soyuz spacecraft. It will be history's first international manned space flight.