Laser-armed Stryker at Fort Sill. ARLINGTON: The Army is dialing up its lasers, from 5 to 10 kilowatt weapons that torched quadcopters in successful tests to 50 to 100 kW weapons that could kill helicopters and low-flying airplanes — and, possibly, blind cruise missiles as well. Given rising anxiety over Russia’s Hind gunships, Frogfoot fighters, and…