I disagree, respectfully, with the statement this was not gross negligence. To me, it fits that criteria perfectly. After the first incident, where he sent a jump drive to the wrong person, did he become more careful with the classified documents?
No, he was very irresponsible in the way he handled the sealed photos and documents. These were highly sensitive photos he was in charge of, and he did nothing to protect them. They should been locked up when not in use. Not left out on a table in an unsupervised room, while people were allowed to wander around in the area.