FYI.
Here in NYC each Memorial Day weekend they bring in all kinds of naval vessels for fleet week and berth them on the west side of Manhattan. Yesterday the (I assume) National Guard started setting up. Fences, extra concrete barriers and the same Homeland Security black x-ray van they used to scan vehicles before arriving at the passenger terminals. My gut is the the precautions are normal if not slightly more pronounced than usual.
I've noticed more cops on foot patrol around here lately...