Running around with no helmets
It was so distracting in the whole Washington scene. And they DID have them early on. And I don't see them losing helmets. Looks like they just decided not to wear them. Into the freaking battlefield.
Not to mention soldiers would not allow them to run around and would simply give them their helmets.
I assume director wanted actors pretty faces to be shown and made them not wear helmets. Would never happen in real war with press. They always wear it.