As part of an expanding programme of battlefield automation, the US Air Force has said it is now training more drone operators than fighter and bomber pilots and signalled the end of the era of the fighter pilot is in sight. Just three years ago, the service was able to fly just 12 drones at a time; now it can fly more than 50. At a trade conference outside Washington last week, military contractors presented a future vision in which pilotless drones serve as fighters, bombers and transports, even automatic mini-drones programmed to attack in swarms. Contractors made presentations for nano-size" drones the size of moths that can flit into buildings to gather intelligence; drone helicopters; large aircraft that could be used as strategic bombers and new mid-sized drones could act as jet fighters. This Terminator-like vision in which future generations of fighter aces become cubicle-bound drone operators thousands of miles from conflict is already here: the deployment that began during the Bush administration has accelerated during the first seven months of Obama's term. Some 5,000 robotic vehicles and drones are now deployed in Iraq and Afghanistan. By 2015, the Pentagon's $230bn arms procurement programme Future Combat Systems expects to robotise around 15% of America's armed forces. As US domestic approval for the "Af-Pak" conflict slips (a new Washington Post poll found less than a quarter of the US public support sending more troops to Afghanistan), the reliance of drones is likely to grow, analysts say. The air force study suggests areas of warfare too critical for automation, including dogfighting and nuclear-bombing, could eventually be handled by drones.