When you think about it, Threlkeld and his crew were exposed to the same peril as the rest of that platoon... maybe not as much as the hero walking point, but in a crossfire, press credentials don't help against bullets. They got the full experience of humping equipment through a jungle in the 100 degree heat (and 90+ percent humidity) and waiting for those bullets to fly. Most importantly, they were able to show America what a nightmare, and exercise in futility that war was.
Well, we can't have that. When the US went into Iraq, I'm not sure about the first time, but definitely in the 2003 invasion, they made it a point to "embed" or we should say "muzzle" the press. Instead of reporting the war, the press was largely reduced to issuing press releases from the Department of Defense... nice... neat... positive.
The last thing we want, is a free press. They might accidentally show the truth and allow people to draw conclusions they're not supposed to.
The press was often vilified for showing us that war from the ground level (which apparently means "with bias"), and politicians were blamed for losing it. Both statements are rich. Without the politicians we wouldn't have been there, and without the press we wouldn't have known anything about it.