With that many people crammed into such a small space (approx. 146 acres), you knew there were going to be medical emergencies. And, sure enough, an ambulance had to make its way through the crowd with the help of D.C. police.
Also, members of the National Guard were kept busy helping to reunite people who had become separated from each other. I watched this fellow, for instance, find a young boy who had been separated from his family. He lifted the young man into the cab of his truck and then posted a sign indicating to the family where he could be found.