National Journal: American commanders in Afghanistan are for the first time systematically using aerial drones to kill militants planting roadside bombs, the low-tech, low-cost weapon that has emerged as the biggest threat to U.S. and coalition forces throughout the country. The shift, the details of which have not been reported previously, represents a sharp escalation in the military's ongoing fight against improvised explosive devices, or IEDs, which account for nearly 60 percent of coalition battle deaths in Afghanistan. The push is being led by a new military unit called Task Force Falcon Strike. It began operating in southern Afghanistan late last year and expanded over the summer to eastern Afghanistan, a violent, insurgent-dominated area along the porous border with Pakistan.