[SOLVED] Problem with mission DEFINITIVE RECOGNITION

Well, before explaining my problem, I put an image of what I need to complete the mission:

Well, as you can see I'm missing the "mark 25 vehicles" part.

Can anyone explain to me how I really should do it?

I give the "Q" key when I see a vehicle and it does not count. I've even tried to destroy (and let them destroy) some while I've marked it and there's no way to tell me about the mission.

The truth is that I do not quite understand if this is not the way I mentioned it.

Thanks in advance.