A system for the hookup of either a manned or unmanned air vehicle with a refueling air vehicle. A probe extending from an air vehicle being refueled is joined to a drogue at the end of a boom on a refueling air vehicle. In bringing the probe into the drogue an optical sensor on one of the vehicles is employed in conjunction with optical beacons on the other vehicle with the sensor measuring the relative motion between the probe and the drogue and generating a control signal for controlling motion of the probe relative to the drogue. The positioning of the probe relative to the drogue is accurately controlled during the fueling operation by a rigid actuator mechanism formed by a rod sidably fitted within a sleeve, the rod being driven by a tensioned reel in response to control signals. One end of the actuator is connected to the drogue while the other end is connected to the refueling aircraft to form a triangular configuration, allowing only small interaction forces thereby restraining relative motion between the probe and the drogue.