The reason is simple.....Its EVERY BOA in the country:
BOA just shuffled the paperwork such that they have now put the FDIC - and by default the US taxpayer - on the hook for their entire 76-TRILLION exposure in derivatives...
Those guards are there to prevent a run on the bank, stop protesters, figure out where the kids lost the remote, hold on tight for this one.
It is a possible bankruptcy?
They usually have guards on hand when assets are taken over and that's the first thing employees see when they show up for work the next day, is someone telling them their job is gone.
Maybe this evening they'll have someone going through all the paperwork at that branch before people show up tomorrow.