What vital information did John Paul Vann include in a three-page report to General Harkins and Colonel Porter regarding General Huynh Van Cao's approach to the war?

John Paul Vann discovered that General Huynh Van Cao was not patrolling villages controlled by the Vietcong and was actively trying to avoid confrontations with the communist fighters whenever possible, often spending large amounts of time in unpopulated areas. If General Huynh Van Cao did engage the VC, he made sure there were superior numbers on his side. In short, he wasn't conducting the war with the intent to win.