Crewchief on OH58D and CH47E for many years while in. A lot of the formations you see or back and forth may be training that is required to maintain status. I know I've jumped out at Key West so I could have my water jump so I'd qualify for Jump Master School. Doesn't mean that we were training to jump onto US coast lines... Just meant that water jumps are required for Master Wings...
You also need formation flight time, aerial refueling if capable, gunnarys, over water time required for ship landings, just many things that could have flight crews pulling flights over Florida.
Or they could be preparing for invasion and subsequent encampment of US citizens.