1. For additional ideas, check google images for "safety tape", "diamond plate", and "speaker grill"
2. You may also want to check for "army stencil font" and possibly use that style font for some of the logo.
3. For those wanting to submit additional round or "badge or stamp" type logos, I own a different company that has a round logo with a distressed look, that you may want to use as inspiration. For that, look at my logo at
http://www.ultimatedjplaylist.com/ 4. Good job on the check mark in the A. You might also want to try an "A" with a little more curve instead of being perfectly straight lines. Or you may want to try a check mark that looks handwritten.
5. Would like to see more blues and/or greens and less red.
6. Also would like to see how you can incorporate 1 or more of the elements mentioned above (safety tape, diamond plate and speaker grill)