Predicate your answers towards the respective agencies' mission, and do some research on its charter, mission, history, etc. Just walking into an oral board with a few pre-canned, generic answers won't really set you apart from your fellow applicants.
I became an LEO after serving in the military, and after contracting in Iraq / Afghanistan for several years. I like the para-military structure, being a part of something bigger than myself and continuing to serve.
You'll be fine, dude.