You revert to a secret clearance as an officer. You can walk in to any SSO and they can pull up your clearance info on their DONCAF computer and give you access to SIPR, etc. That's exactly what I had to do here since the ROTC unit isn't wired for SIPR. The rest of your post is spot on.
Brett
Copy all. I think we're saying the same thing, you're just using more precise language. Someone still needs to determine that you have the need to know (which may take all of 5 minutes) and therefore "clear" you to see secret squirrel stuff.