Is security something you wish to stay in? I mean do you plan on moving into a law enforcement position?
Lots of people apply for a limited position in security at these plants, and to be honest, I don't think they require degrees. Your time in the Corps would help, but not solidify it.
If you are thinking of doing 2 more years of school, why not get a degree in some kind of Nuke study? HP techs are needed in this field. There are many going into retirement that were the baby boomer generation. Plus I think the pay is a "bit" higher.

If you use the search bar above this thread, you will see others asking similar questions to yours and had very little to no luck.
There are schools that you can get a 2 year degree in RP online. You can web search them or look in our training section for referrals.
Welcome to Nukeworker, and good luck to you.
-Doc