John Vann became increasingly deluded about the Vietnam War.

Evidence

The John Vann his old friends had known had disappeared into the war. … The war satisfied him so completely that he could no longer look at it as something separate from himself. — Neil Sheehan, A Bright Shining Lie, 2196

Categorization

• corroborated: 2 independent passages support this claim — Neil Sheehan, A Bright Shining Lie, 2196
• XREF: connects to: American military reports were overly optimistic and non-critical. — Neil Sheehan, A Bright Shining Lie, 825