R-First

R-First is an Autobot drone from the Wings Universe portion of the Generation 1 continuity family.

R-First was Sentinel Major's personal drone, followed by R-Second and R-Third.

Fiction

Wings Universe

Wings Universe is based on the Generation 1 cartoon, but deviates from it in cosmetic ways and continuity points.

R-First apparently displeased Sentinel Major enough that he replaced it with R-Second. A Team Effort