Water trucks just like this one visit office buildings every day.
They bring clear refreshing water or bombs, or terrorist attacks to any venue.
A nice little SWAT team vehicle.
Modern wargames often involve police, and in some nations police fight terrorists every day.
Two K-9 vehicles and a SWAT team.
The orange Oshkosh M-ATV with the older green one.
I have found both in stores in the past month.
The key is keeping your eyes open and you can find some inexpensive and interesting wargame vehicles.