Coasties (or somebody) are racing up and down the river now (two boats that look identical) ...
Video link of river (live as of 10:48 AM EDT):
No freaking way would a professional schedule an exercise with POTUS in the mix. EVERYONE would have to be clued into the exercise so they didn’t react to the simulation. And if EVERYONE was clued in then a real threat would be dismissed as part of the exercise and likely succeed.