Bluford then served on the crew of STS-61-A, the German D-1 Spacelab mission, which launched from Kennedy Space Center on October 30, 1985. This mission was the first to carry eight crew members, the largest crew to fly in space and included three European payload specialists. This was the first dedicated Spacelab mission under the direction of the German Aerospace Research Establishment (DFVLR) and the first U.S. mission in which payload control was transferred to a foreign country (German Space Operations Center, Oberpfaffenhofen, Germany). During the mission, the Global Low Orbiting Message Relay Satellite (GLOMR) was deployed from a "Getaway Special" (GAS) container, and 76 experiments were performed in Spacelab in such fields as fluid physics, materials processing, life sciences, and navigation. After completing 111 orbits of the Earth in 169 hours, "Challenger" landed at Edwards Air Force Base on November 6, 1985.