Crocca is internationally known for having proposed, in 2006, a new Nomen nudum taxonomic system that would include the hypothetical bacterium thought to have been detected on Mars by the Viking lander in 1976.
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During his first administration at NASA, Fletcher was responsible for beginning the Space Shuttle effort, as well as the Viking program that sent landers to Mars.
James Slattin Martin, Jr. (1920–2002), project manager for the Viking program