when an American is traveling with the enemy...He’s no longer an American...he’s the enemy!!!
The Associated Press & the rest of the media tries to make it a difficult, moral decision. It is not, it is simple & straight forward, they are the enemy.
More precisely, by providing propaganda coverage for the enemy side (since they would only be allowed to come along in exchange for favorable coverage), he is giving "aid and comfort to the enemy", which is punishable by death.
As a practical approach, I would regard enemy-embedded reporters as invisible, in that I would not be deterred by their presence before opening fire.