Titan IIIB
Titan IIIB was the collective name for a number of derivatives of the Titan II ICBM and Titan III launch vehicle , modified by the addition of an Agena upper stage . 
<triplet> Titan II <subj> ICBM <obj> subclass of <subj> launch vehicle <obj> subclass of <triplet> Titan III <subj> launch vehicle <obj> subclass of