In the interest of being totally correct, MCPON is an E-10. See http://www.nps.navy.mil/Code22/milrank.htm
Also, there is NOT one MACM per ship. Only large ships would have an Master At Arms that senior.
[Again, no, I have not served a tour aboard a ship, but I DO know how to do some pajama research.]
"He's not listed as MCPON. He gave his rank as MACM. Both are E-9. There are several othe E-9 master chief designations."
> In the interest of being totally correct,
> MCPON is an E-10.
> See http://www.nps.navy.mil/Code22/milrank.htm
Well, I'm sure you can understand FUBAR when you see it.
http://www.defenselink.mil/specials/insignias/enlisted.html
http://www.chinfo.navy.mil/navpalib/ranks/rates/rates.html
http://www.army.mil/soldiers/jan2004/pdfs/ranks.pdf
Actually, not only large ships would have them - I was on a ship in the late 80s, early 90s, that had two Senior Chief Petty Officers, plus a Master Chief... We were a small ship - well less than 100 guys.