on 16 february 1972, a titan iii(33)b failed to achieve orbit carrying a jumpseat satellite. another failure occurred later the same year, when on 20 may a titan iii(24)b malfunctioned during the launch of kh-8 #35. the agena suffered a failure of a pneumatic regulator during ascent and reentered the atmosphere. although it had been assumed debris would land near south africa, pieces turned up in faraway great britain a few months later. the launch of kh-8 #39 on 26 june 1973 also failed to orbit when the agena had a fuel valve failure, preventing engine start. a launch of a jumpseat satellite on 24 april 1981 was a partial failure when the agena failed to separate.