Chief Master Sergeant is the one after Master Sergeant.
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abbreviate "Master Sergeant retired
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Master Sergeant in the Army is pay grade E8. First Sergeant is
the other Army E8 rank.
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NO YOU CAN NOT ADDRESS A MASTER SERGEANT AS "SERGEANT"!
Yes you can do this in the Army but should you address a Master
Sergeant in the Marines as a Sergeant or "Sarg" your going to hear
some vocal cords at high volume in your face.