In the beginning Ironhide says he got a job for you, and that you need to scan a helicopter to get an "aerial advantage". Once you scan it the controls page will open. Then he tells you to follow a convoy and keep it safe while you are in vehicle form. Basically all you have to do in this mission is keep an eye on the convoy, and shoot any Decepticons you see, but do not transform. The convoy stops whenever there are Decepticons in the area.