Caprican Cylon Brigade
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The Caprican Cylon Brigade is a force of Antebellum Centurions consisting of pre-Cylon War basestars and Raiders who fought in the Third Colonial Conflict.
The surviving members of this brigade were found after the Fleet's departure from Kobol and the subsequent discovery of the "Returners". After encountering their basestar (which is destroyed by Cylon demolition gel and a nuclear warhead launched by William Adama) and a subsequent phalanx of Raiders, Adama brings the survivors of this brigade to the Fleet, much to Laura Roslin's vociferous objections (Battlestar Galactica 4).