Excellent quote lifted from one of my favorites, Ol’ Remus at the Woodpile Report:
With local law enforcement, their mission is to solve crimes after they’ve happened, and to ensure that people’s constitutional rights are protected in the process. The military obviously has a mission where they are fighting an enemy. When you use military tactics in the context of law enforcement, the missions don’t match, and that’s when you see trouble with the overmilitarization of police.
Jesselyn McCurdy, ACLU, quoted by Andrew Becker at thedailybeast.com
… couldn’t have said it better myself.  Dang it, and it was from an ACLU lawyer.  DANG IT!