AT2 are guided anti-tank missiles. Aiming them is a hassle and unless you want to just fire them and pray you hit, you can use the AI to your advantage.
Before you leave on a mission with the AT2 guided rocket layout, the mission after the AT2 training mission being the first, be sure to
change your gunner from manual to automatic.
You will notice that the white gunner reticule moves automatically over targets. Not only does this allow you to automatically target your machine gun (
), it automatically locks all guided missiles much more accurately then you ever could.
With this trick in mind, it is easy to get kills with the AT2 or any other guided missile.