The military is moving more machines into battle to save both money and lives. “Well before the end of the century, there will be no people on the battlefield,” said Robert Finkelstein, a professor at the University of Maryland’s School of Management and Technology.

Stryker, one of the U.S. Army’s newest infantry vehicles, is fitted with a “ladar” scanner, the equivalent of a mounted pair of eyes that see by emitting 400,000 laser and radar beams and snap 120 camera images every second. Its brain — a 40-pound computer system tucked inside its body — processes that data, and makes instant judgments on how to act and where to go.

By 2010, robotic Strykers and similar contrivances are slated to be in use as all-purpose battlefield vehicles, surveying battlegrounds, sniffing for land mines, or transporting supplies and troops to the front line.