The crossword solution for the term Astronaut Deke Slayton is a seven letter word. Deke Slayton was an American astronaut and one of the original Mercury Seven astronauts selected for the United States' first human spaceflight program. He was also the only one of the seven who did not fly in the Mercury program, but he flew on the Apollo-Soyuz mission in 1975. He was also a test pilot and served as NASA's Director of Flight Crew Operations from 1963 to 1972.