I was told 3 was the min. from life lessons doing the minimum is never a sign of a go-getter. First board I believe I had 4, non-select. When I was pro-rec I think I had 6. I had some form of personal relationship with them all, varying in length. Shortest was the CO of our local reserve unit, that my OR coordinated. He is a Commander, S-3 Viking pilot and IP for last 8 ish years, so not only good recommendation, but a connection that will carry through my entire career. Plus, an awesome guy to go out and shoot the shit and hear cool navy experiences while I finish school.