NEW YORK — Captain Ferguson (a fictitious name) gets up early in the morning, and has breakfast with his wife and children. At the office, he sits in front of a computer off and on for almost eight hours. At the end of the day he heads back home. Ferguson's wife is glad to see him as they discuss the events of the day. He does so, with one omission.

By most measures it has been a beautiful day — beautiful if you don't consider Captain Ferguson's omission. While sitting in front of his computer, he was directing unmanned aerial vehicles (UAVs), also known as drones, to unleash powerful bombs in distant countries.

Today he presumes, but is not certain, that his bombs hit the right target. After they exploded, four suspected terrorists were killed. That's four fewer criminals the United States has to deal with.