They could function in a number of ways...
A. They are attached to the US unit, who would need to try keep them out of harm's way as they try to get into it.
B. If you are doing a campaign or linked games, what the press observes and records can influence the narrative. Both heroic and less-than-heroic actions can be influence future morale and RoEs, for example.
C. If they are armed, they could even influence the fighting in some manner, perhaps with a die roll to determine if/how they might intervene.
D. They can simply be set dressing, and not affect things at all.
Just some ideas I have used...