Hi Capecod! I'm a new CGAUX member, having "joined" in Sept. 2010 but sworn-in in November. I'm former Air Force intel and have boating experience. I joined because I wanted to contribute to our local boating community and also have a small touch back with the military. There is plenty you can do in the Auxiliary. None requires a military or boating background. The main website has a lot of great info.
Check it out at http://www.cgaux.org/.
There are no "slots" or billets, as we knew them in the military. There are elected and staff officer positions but, like with any "club" or civilian organization, the authority of those positions is limited to the flotilla itself.
Basically, the primary mission of the CGAUX is boater education and safety. As such you can be a vessel examiner, BS&S instructor, things like that. Personally, I like the operational missions we do in our area, which is the west coast of Florida. We assist the regular Coast Guard by performing harbor patrols, port security patrols, and event security for on the water events like boat races.
There is so much you can do and any flotilla would love to have someone like yourself join them. You do have to buy your own uniforms and such, but the nice thing is they are actual CG uniforms, with the CGAUX insignia and markings. Regular CG is the "gold side". We are the "silver side". Other than that the uniforms are pretty much identical.
I encourage you to check out a local flotilla and ask questions. I've found it to be a fun and rewarding experience in my short time.