Original: The missile was originally given the military designation XB-65, thus making it a bomber; from 1955 it was redesignated SM-65 and, from 1962, it became CGM-16.
Simplified: The missile was originally given the military designation "XB-65", thus making it a bomber; from 1955 it was redesignated "SM-65" and, from 1962, it became "CGM-16".