Comment: It's the logo for the Guardian Angels which was

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In reply to comment: is Lisa Evers wearing an (see in situ)

It's the logo for the Guardian Angels which was

started back in the 70's when police weren't doing enough to protect its citizens. What else is new, huh? Anyway, the founder, Curtis Sliwa's heart seemed to be in the right place at the time for the purpose of protecting NYC's citizens. That is of course, if he didn't plan all along to use it as political leverage to further another agenda.
http://en.wikipedia.org/wiki/Guardian_Angels

Here's another interesting view point as well as the logo you mentioned:
http://www.examiner.com/article/guardian-angels-1