Downforce

One of the first Autobots, Downforce was one of the first Autobot generals before he retired to become a trainer of new soldires. Despite often being annoyed by how inexperienced new Autobot soldires can be, he's still quite enjoys his current job as a trainer, even if a part of him wants to become a general again.

He also turns into a strange Helicopeter-Tank vehicles 

History:

Downforce was forged during the Guardian Priem era, where at somepoint he aquired his Helicoper-Tank mode. During the Guardian-Malignus war he would join Nominus Prime Autobots and would become a genral during the Nominus Prime to Zeta Prime era before he retired to become a trainer of new students. 

Notes:

He's based on Transformers RPG Downforce