I am not a Delta either, but I have meet quite a few in other areas of life excluding community service.
You may have met one or two and not even know it. I have gotten to know a member really well and found out after 2 years of knowing her that she is a Delta. That was because I had causally mentioned my interest after I graduate, and now she is one of my mentors!
Keep doing your service and always put your best foot forward.
Just remember you never know who's watching!