6B-7 0 V A L K Y R I E V A R I A NT S : A F U T U R E T H A T N E V E R W A S . . Left: Some vehicle types, such as the Martin SV-5 lifting body suborbital test vehicle, required only forward and aft fair-ings instead of a full enclosure.Below: Lockheed built the RM-81 Agena originally for the WS-117L reconnaissance satellite program. After WS-117L split into three separate programs, the Agena became an upper stage booster and satellite carrier. Launching the Agena from a recoverable booster such as a B-70 would save significant cost over the large, disposable rockets of the era.