RedactedNarrative: VESSEL 1 AND VESSEL 2 WERE MOVING IN AN EASTBOUND DIRECTION ON FT SUPPLY LAKE.   THE OPERATOR OF VESSEL 1 WAS TRAVELING AT A HIGH SPEED AND MADE A U TURN IN FRONT OF VESSEL 2, STRIKING VESSEL 2 HEAD ON, RAMPING OVER VESSEL 2'S BOW AND STRIKING VESSEL 2 OPERATOR IN THE HEAD.  POI WAS APPROX. 1300' EAST OF THE MAIN BOAT RAMP AND 300' SOUTH OF THE FT SUPPLY DAM.  POR WAS UNKNOWN VESSEL 1 AND VESSEL2 WERE REMOVED FROM THE WATER.