Unfortunately, there aren't a whole lot of vids out there of military lasers in action, which kinda sucks, since they are spending our (those of us who live in the US) tax dollars to build them!
But, if there's video footage of any tests, it's likely been uploaded and copied to Youtube by now.
BTW, if you are into laser weapons (real ones) there is a book compilation of all the available info on the internet about them. It isn't cheap, but would probably save you many hours of Googeling..
"2009 Ultimate Guide to Laser Weapons - Defense Department Research on High-Energy Laser Systems - Ground, Air, Space Based, Solid State Systems"
Sorry, pinged, but we're not a military forum here, so we don't get a lot of exposure to military grade systems here. We're more into pointers, labbies, and the odd IR diode bar. Military lasers are a problem to get real, accurate, and reliable info on. These are cutting edge, expensive, and highly classified devices and capabilities. North Korea and Iran would love to know what US lasers can really do. So would a lot of other countries, even allied ones. Unfortunately this means that we will only get fragments of old, obsolete information and few photos or videos that show anthing meaningful. Since Sept 11, a lot more capabilties are probably kept secret that may not have been before the events in NYC that day.