I have used a "Quik Kut Glass Removal Tool" to take out auto windshields, I've also used sawzalls but I can't see keeping that in a bag under my desk, <img src="images/graemlins/smirk.gif" alt="" />.

The sawzall takes about 45-50 seconds if you've had practice, the Quik Kut takes about 2 minutes. YMMV

The Quik Kut did a nice job but it did take a little work. (But if you have to use it you'll probably on an adrenalin rush so it doesn't matter)

You will need to have a suction cup or some other means to pull the glass inside not out on to rescuers.

Nothing wrecks my day more than having glass fall on me at a fire scene.

Quik Kut

FYI I have no association with this company I've just used thier tool.