For more than five years, Brandon Bryant worked in an oblong, windowless container about the size of a trailer, where the air-conditioning was kept at 17 degrees Celsius (63 degrees Fahrenheit) and, for security reasons, the door couldn’t be opened. Bryant and his coworkers sat in front of 14 computer monitors and four keyboards. When Bryant pressed a button in New Mexico, someone died on the other side of the world. The container is filled with the humming of computers. It’s the brain of a drone, known as a cockpit in Air Force parlance. But the pilots in the container aren’t flying through the air. They’re just sitting at the controls.

Bryant was one of them, and he remembers one incident very clearly when a Predator drone was circling in a figure-eight pattern in the sky above Afghanistan, more than 10,000 kilometers (6,250 miles) away. There was a flat-roofed house made of mud, with a shed used to hold goats in the crosshairs, as Bryant recalls. When he received the order to fire, he pressed a button with his left hand and marked the roof with a laser. The pilot sitting next to him pressed the trigger on a joystick, causing the drone to launch a Hellfire missile. There were 16 seconds left until impact.