Thanks for that clarification /u/fatherfatpants -- yes you can start under for example a DSAP - District Shortage Area Permit - and have a bachelor's only, but then you still have to go through their intensive certification program (it was called BEST when I went through it, not sure what it's called now) and you're expected to get your Masters within a few years. It's intense. Just teaching, doing it well, with all the reflection etc involved, is exhausting in and of itself.

Totally worth it though.