Answer:
What lives where it cannot breathe and has a hole in its back
Known for their natural tuxedos and marching.
Long slim and slender. Dark as homemade thunder. Keen eyes and peaked nose. Scares the Devil wherever it goes.
When I'm metal or wood, I help you get home. When I'm flesh and I'm blood. In the darkness I roam.
What has armor but is not a knight, snaps but is not a twig, and is always at home even on the move?
When someone uses this acronym, you know you've got to pick up the pace