From Rumble02:

"Skyjax is Leader of the A.D.C.U and is a repaint of Cybertron Evac with voyager class movie Prime head swap:

Skyjax

Allegiance Autobot

Function A.D.C.U. Supreme Commander

“I may not lead the army, but I can secure my own victory.”

Skyjax is the Supreme Commander of the A.D.C.U. with Grit as his second in command. Skyjax is devoted to the A.D.C.U. and the Autobot cause, but he has bitter feelings towards Optimus Prime. Skyjax felt he should have been chosen as the next Prime and finds Optimus to be inferior due to the fact that he can not fly on his own. Prime and Skyjax have fought about this on numerous occasions, and a time or two the altercations have left both in need of serious repair. In some ways Prime respects Skyjax’s attitude and had at one point tried to give him the Matrix. Skyjax’s body could not handle the energy and he returned it to Prime.

Now as he leads his rescue team he lets them do the clean up while he continues to fight off any advancing Decepticons. He fears that one day his old comrade and now greatest enemy will return and try to claim Skyjax’s spark. He is unaware that that day is fast approaching."

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