Late last month, Boeing conducted a series of tests at Redstone Arsenal in Alabama with a 1-kw laser mounted on the back of a converted anti-aircraft Humvee. Shooting an invisible beam just a few centimeters in diameter and 20 times hotter than an electric stovetop, the laser burned a hole through the casing of artillery and mortar rounds, detonating them more or less instantly. (As for bystanders, all bets are off.)
Also in PM from a couple of months ago: Pop-Up, Roof-Mounted Gatling Gun Is Latest in Auto Safety on the Dillon Aero option.
Both articles with pictures.