Back when the war was at its worst, even the Autobots who werent' programmed to fight were called into battle.  More than once, Autobot Ratchet was forced out onto the battlefield not just as a medic, but as a warrior.  They're not memories he likes to recall, but he learned more than one lesson that has saved his life in the years since.  

Galactic Powers & Abilities:
> Injured Autobots often request him as their medic.
> Specializes in modifying armor and weapons to peak conditions.
> When fored to fight, usually shoots to sisable, instead of destroy.