It was a four - stage rocket , based on the earlier Scout X-1 , uprated first and third stages .
Scout X-2 was an American expendable launch system and sounding rocket which was flown twice in 1962 .
Scout X-2 was a four - stage rocket , based on the earlier Scout X-1 , uprated first and third stages .
Scout X-2 was an American expendable launch system and sounding rocket which was flown twice in 1962 .