Since Vietnam TV has changed. Cameras were heavy and cumbersome back then. Difficult to handle, easier for authorities to control. Now cameras are light and inexpensive. You could afford to put one on every tank to let people watch the invasions and the retreats - if you were foolish enough.

Handheld cameras are on the street - everywhere - hard to control. Catches the troops on their bad days when they aren't their best. Perhaps things aren't much grimmer than they were in old wars with less coverage. It was shitty back then, for sure.   

Everyone has bad days but it doesn't give a good impression on the news channels. For future invasions, armies might have to take Miss America training - walk straight, stick the chest out, smile, say something light and positive.