Premise: Source: Alan Shepard
He was Chief of the Astronaut Office from November 1963 to July 1969 ( the approximate period of his grounding ) , and from June 1971 until his retirement from the United States Navy and NASA on August 1 , 1974 .
Hypothesis: In 1974 Alan Shepard retired from the US Navy.
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premise_text: 1974
hypothesis_text: In 1974
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premise_text: Alan Shepard
hypothesis_text: Alan Shepard
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premise_text: He
hypothesis_text: Alan Shepard
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premise_text: retirement from the United States Navy
hypothesis_text: retired from the US Navy
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premise_text: retirement
hypothesis_text: retired
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premise_text: on August 1 , 1974
hypothesis_text: In 1974
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premise_text: He
hypothesis_text: In 1974
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premise_text: until his retirement from the United States Navy
hypothesis_text: retired from the US Navy