Telling it like it is was not appreciated by his superiors. Saigon looks so very civilized and isolated from the war, but the rural areas are seen as a constant source of danger. Both are true, but any city could be a dangerous place. One scene in the movie struck me as being very unrealistic. Soldiers riding in a truck on a city street encounter a traffic jam.
Nobody gets out of the truck.
If this had happened in Da Nang or Hue in my unit, everyone would have gotten out of the truck and formed a perimeter to guard against an ambush. Different time, different place, different reaction.