With Tuesday's early dismissal from work, I did a little Brooklyn railfanning and caught the LIRR from Flatbush Avenue. Going up to the street to look around while waiting for my train, I noticed a Chase Bank security guard standing at the top of one of the stairways. This sight jarred my memory a bit, and I recalled seeing Chase guards on duty there on the prior occasions I've used Flatbush. Chase has a large facility at MetroTech but nothing in the immediate vicinity of the terminal. Why would it have a guard stationed there?