Byron McCandless is the grandfather of this NASA astronaut who made the first ever untethered free flight in what year?
Bruce McCandless II: Bruce McCandless II (born June 8, 1937), (Capt, USN, Ret.) Bruce McCandless II:  During the first of his two Space Shuttle missions he made the first ever untethered free flight using the Manned Maneuvering Unit in 1984.
i don't know