STS-68 Endeavour was part of NASA's Mission to Planet Earth. STS-68, Space Radar Lab-2, was the second flight of three advanced radars called SIR-C/X-SAR, and a carbon-monoxide pollution sensor, MAPS. SIR-C/X-SAR and MAPS operated together in Endeavour's cargo bay to study Earth's surface and atmosphere, creating radar images of Earth's surface environment and mapping global production and transport of carbon monoxide pollution. Real-time crew observations of environmental conditions, along with over 14,000 photographs, aided the science team in interpreting the SRL data. The SRL-2 mission was a highly successful test of technology intended for long-term environmental and geological monitoring of planet Earth. STS-68 launched from Kennedy Space Center, Florida, and landed at Edwards Air Force Base, California. Mission duration was 11 days, 5 hours, 46 minutes, traveling 4.7 million miles in 183 orbits of the Earth. STS-79 Atlantis, the fourth in the joint American-Russian Shuttle-Mir series of missions, launched from and returned to land at Kennedy Space Center, Florida. STS-79 rendezvoused with the Russian Mir space station and ferried supplies, personnel, and scientific equipment to this base 240 miles above the Earth. The crew transferred over 3.5 tons of supplies to and from the Mir and exchanged U.S. astronauts on Mir for the first time – leaving John Blaha and bringing Shannon Lucid home after her record six months stay aboard Mir. Mission duration was 10 days, 3 hours, 18 minutes, traveling 3.9 million miles in 159 orbits of the Earth. STS-89 Endeavour, was the eighth Shuttle-Mir docking mission during which the crew transferred more than 9,000 pounds of scientific equipment, logistical hardware and water from Space ShuttleEndeavour to Mir. In the fifth and last exchange of a U.S. astronaut, STS-89 delivered Andy Thomas to Mir and returned with David Wolf. Mission duration was 8 days, 19 hours and 47 seconds, traveling 3.6 million miles in 138 orbits of the Earth. STS-106 Atlantis was a 12-day mission during which the crew successfully prepared the International Space Station for the arrival of the first permanent crew. The five astronauts and two cosmonauts delivered more than 6,600 pounds of supplies and installed batteries, power converters, life support, and exercise equipment on the Space Station. Two crew members performed a space walk in order to connect power, data and communications cables to the newly arrived Zvezda Service Module and the Space Station. STS-106 orbited the Earth 185 times, and covered 4.9 million miles in 11 days, 19 hours, and 10 minutes.