I asked a recruiter I know and here is what he told me, non-verbatim:
You can't be in because you can only bring to basic a few things that they allow you to. Insulin is not on this list. If you can't get through basic without it, you can't join.
But hey on trying bud. If you want to help out the war effort, maybe work for an armaments factory or something along those lines? Just as necessary and noble IMO.