“Federal law prohibits political campaign or election-related activities within Army National Military Cemeteries, to include photographers, content creators or any other persons attending for purposes, or in direct support of a partisan political candidate’s campaign,” according to the statement. “Arlington National Cemetery reinforced and widely shared this law and its prohibitions with all participants.”
Really? Why is it illegal to film there?
From the NPR article linked above
I don’t know the details of that, but presumably because it would be considered disrespectful.