Waldron is mentioned in passing in the book Sharpening the Combat Edge: The Use of Analysis to Reinforce Military Judgment
...As an interesting war story, our most successful sniper was Sergeant Adelbert F. Waldron, III, who had 109 confirmed kills to his credit. One afternoon he was riding along the Mekong River on a Tango boat when an enemy sniper on shore pecked away at the boat. While everyone else on board strained to find the antagonist, who was firing from the shoreline over 900 meters away, Sergeant Waldron took up his sniper rifle and picked off the Viet Cong out of the top of a coconut tree with one shot (this from a moving platform). Such was the capability of our best sniper. We had others, too, with his matchless vision and expert marksmanship. Sergeant Waldron earned two Distinguished Service Crosses for his outstanding skill and bravery...