Easy way of doing this, if you unlock the Event Rolling Thunder - this will give you the Thermobaric tank.
Jump in the tank, then when the event screen comes up, press B to cancel the event, drive down to the bottom left of the map, where the Blackwatch presence is high (Big blue circle) the one without the base, cause havoc destroy as many tanks as possible, then just wait till the strike team is signalled, its a nice big area with plenty of troops to play around with, it also nice and open to see the choppers coming