Acronyms, How I love Them

Agent Dresco is the perfect story for me to come up with my own acronyms. I love cool acronyms! I am fully aware not to go crazy with them but I do have a few instances in the story where acronyms come into play in a cool way. Not to give anything away, no spoiler alerts here, yet. I do have one and I'd like to hear your guesses on what you think it stands for. Slight description below;

This acronym is for a mech (robot) that is deployed by the police department.

D.O.G.S

A rough sketch should be ready in a few days to really through you off. I look forward to your guesses. Maybe you'll win a prize for being the best/funniest guess that makes sense.