At the Bellmore LIRR station, there was a Nassau County Police Officer. At Merrick, two of them. Of course, Penn Station is teeming with cops, soldiers, etc.
What I think at seeing all of them is, will this help? The terrorists are vicious, rabid animals, but are they stupid enough to strike a prime target like New York now? I doubt it. I would expect them to wait or to strike at some lower profile place, maybe somewhere in the Midwest. There are plenty of "softer" targets that, sadly, would still offer a high body count.
I suppose no one wants to be held accountable for not stepping things up here (and in other high-profile locations), in case something happens, but is it doing any good or could this vast expense be better used? I don't have an answer, and I don't know if anyone can answer that. I just wonder.
On top of all that, they put the more seasoned cops out there when these things happen. I suppose their experience is reassuring, but the younger ones are cuter. ;)