I thought everyone knew the NYPD had a pipe band. Both the NYPD, and the FDNY have pipers. This year, on St paddies weekend the NYPD pipers were here in Boston where they had a battle of the piper bands with the BPD at Doyle's. BFD also has a pipe band.

http://www.bgfb.org/

I don't think any of them are regular kilt wearers however. Seems they only wear them for piping.