here's what I worked on for almost 10 years...
http://www.youtube.com/watch?v=YVt7dq-magE
The original unit I worked with was pulled by a Gamma Goat!!! God, I'm old!
Then I changed from an Airborne Rapid Response unit to a regular Air Defense unit.
http://www.youtube.com/watch?v=tMWr3OY0xEM&NR=1
Technically, we're not allowed to use these weapons against personnel but have so much as a Big Wheel with a flak jacket draped over it and it's on!!!!
Hint: if you ever face a stubborn group of Iraqi soldiers, have 3 or 4 of these units drop 100 round bursts 20 or so feet in front of their position and watch the white flags come out!