original_query: What was the purpose of the Saturn V dynamic test vehicle (SA-500D)?
query: What was the purpose of the Saturn V dynamic test vehicle (SA-500D)?
answer: The Saturn V dynamic test vehicle (SA-500D) was used by NASA to test the performance of the rocket when vibrated to simulate the shaking it would experience during launch.  It served as a test vehicle for all of the Saturn support facilities at MSFC and was instrumental in the development of the Saturn V rocket.