So, it’s all about section 60 being the most recent.
But, why only the most recent? Why not all sections, since they contain the remains of military members who still have family members who still visit?
Just a guess but it may have to do with mourners at recent interments.
I know I wouldn’t have wanted anyone taking pictures of my dad’s grave right after he was buried.
Also there’s this:
“Photography
Photography is permitted within the grounds of Arlington National Cemetery. Photographers who are members of news organizations need to make arrangements for a media escort by contacting the ANC Public Affairs Office at 703-614-0024.
We ask media and cemetery visitors to respect the solemnity of Arlington National Cemetery by refraining from taking pictures of or filming someone who is visibly mourning. Please ask for permission to film or photograph those visiting a gravesite.”