Strikes me that the only time you might need to silently disable a vehicle or knock down communication is for covert activities. Basically, this is just a bog old spy toy.
Well...actually quite recently and just down the street...Boeing announces 'Laser Gunship' completion
'Tactical' raygun weighs only 20 tonnes
Airliners'n'deathware behemoth Boeing announced yesterday that it had fitted a high-energy laser cannon aboard a C-130 Hercules military cargo plane, creating a "Laser Gunship". The company expects to commence blasting "mission representative" test targets next year, firing deadly energy bolts from a "rotating turret that extends through the aircraft's belly".
Another blow struck for democracy
The rest of the story.