OMG… this is very wicked. It’s stupid. I’m also in Vermont SC, 500+ days. They said my case is under security check. OnlyGod knows what that means.

are you inside or outside of the usa?

I-485

It's not uncommon for green card and citizenship applications to experience significant delays due to security checks. In some cases, it's simply because your name came up in a unrelated case from many years ago. In other cases, it could be someone with a similar name that raised a flag. Problem is, you have no idea what it is. And oftentimes the delay is not because your case is so complicated, but because it takes a long time for someone in the government to start looking into it. For most people, all security checks eventually come out clear. But the processing delay can cause great anxiety and frustration, in addition to financial burdens while you're forced to renew certain documents.