We have designed a minimally intrusive Operator Control Unit (OCU) intended to be used by a dismounted soldier. The OCU is operated using a combination of head aiming, plus a small wireless controller that is integrated in the grip of the soldier's rifle. This minimally intrusive OCU allows soldiers to navigate a software interface (for example, to call up a map), operate a remote camera system or other sensors on an unmanned vehicle, and/or tele-operate the vehicle itself, all while the soldiers have their heads up and their hands on their weapons. Central to the concept is the idea of a head-aimed software interface, where natural and intuitive head motion is used instead of traditional mouse movements to efficiently navigate, point or even select items in the display-operators simply move their heads in the direction that they want to "look" and the display is seamlessly updated with new information. When combined with the controller that is integrated in the weapon grip, this allows almost hands free operation, as opposed to operating a PDA or other standard controller system which generally occupies both hands and requires operators to look down at a screen.