Michael Richard Uram "Rich" Clifford is a former United States Army officer and NASA astronaut. Clifford is considered a Master Army Aviator and has logged over 3,400 hours flying in a wide variety of fixed and rotary winged aircraft. Clifford retired from the U.S. Army at the rank of lieutenant colonel. He has logged over 12 hours of spacewalk time over three Space Shuttle missions. He is also one of the first people to conduct a spacewalk while docked to an orbiting space station. The spacewalk was conducted during STS-76, while docked at the Russian space station Mir.