The U.S. military plans to more than triple its inventory of high-altitude, armed and unarmed drones capable of 24-hour patrols. The long-range aviation plan delivered to Congress Feb. 2 calls for 800 high-altitude drones, up from 220 currently. We can't get enough drones," General David Petraeus, head of the U.S. Central Command, which includes the Afghanistan and Iraq war theaters, said in a speech Jan. 19. Of the military's 6,819 unmanned aircraft, only the high- altitude "long-endurance" drones can provide ground commanders wide-ranging, round-the-clock surveillance and the opportunity for instant strike. The new planes will include Global Hawks built by Los Angeles-based Northrop Grumman Corp. and Predator and Reaper drones. The Air Force uses those three model drones in Iraq and Afghanistan. Northrop also will build its new "broad-area'' surveillance aircraft for the Navy. The U.S. military currently flies about 39 combat-air patrols for 24 hours each over Iraq and Afghanistan, according to Air Force Lieutenant General David Deptula. The Pentagon has said it would increase the patrols to 50 a day in the next two years and 65 by 2013.