The female mannequin at iRobot’s headquarters in Burlington, MA, is fairly typical: tall and thin, with perfect features and fingernails painted claret red. But instead of designer clothes, she’s modeling combat fatigues and a camouflage vest with a 500-megahertz computer system embedded in it. An eyepiece is mounted over one eye, and she holds a joystick to control the accompanying PackBot, a small, tanklike robot recently deployed in military missions in Afghanistan and Iraq. “She’s looking particularly stylish for a soldier,” quips Helen Greiner ’89, SM ’90, president and cofounder of iRobot. Thanks to PackBot and the Roomba Intelligent FloorVac,...