The Mercury-Redstone Launch Vehicle was a derivation of the Redstone with a fuel tank increased in length by 6ft and was used on 5 May 1961 to launch Alan Shepard on his sub-orbital flight to become the second person and first American in space [REF].
With the arrival of newer solid-fueled missiles that could be stored and not require fueling before launch, Redstone was rendered obsolete and production ended in 1961.