He eventually finished his training at the Autobot Military Academy, but upon graduation was provoked into joining Flattop and Subsea in venturing underground, in order to prove his courage.When a group of Cybertronian Mutants attacked and slaughtered his fellow cadets, Tailgate stood his ground. It's hardly the most unique of flaws, but he has an unfortunate, childlike tendency towards extremes.Placed in a situation with Autobots who don't know him from Primon, this sanitation 'Bot will spin a tall tale the height of a Titan in an attempt to impress his fellows before it all comes crashing down.Easily his most distinctive mental issue is his occasional inability to tell the difference between a non-living Earth machine and sentient robotic life such as himself.While it's a mistake many other Cybertronians have made at first, typically they learn quickly and let it go. Once he gets it into his head, his compassion turns to rage against the "enslavers", and is quite vocal in his desire to "free" the machines of Earth. Tailgate was one of a group of Minibots stationed at the Ark in 2006.None of them fared particularly well in training, however, much to Prowl and Ironhide's dismay.
However, a little quick thinking, and Tailgate was able to use the larger machine's bulk against him, flipping Rotgut into the pyre left in Smeltdown's wake. and also not very good at watching his friends' backs in a fight.
He survived, and travelled to the Hub Network with Rodimus Prime to battle Jhiaxus and survived that too.