It is one of the three Silver Hawks available for Force's unnamed main character, the other two being model ZZ9X-0001 and model FFSA-0019. FRSA-6351 is Red to distinguish it from these two other models (being blue and green respectively). It is the only one of the three to not be deployed in a previous war as noted in bio Roll out time.
Taken from select screen
Silver Hawk Type-3 DEV-NO FRSA-6351
- Roll Out- "- - - - - - - -"