Crossword Genius

U.S.M.C. bigwig (3)

Ross

I believe the answer is:

nco

(Other definitions for nco that I've seen before include "Initially, a corporal or sergeant" , "In brief, a corporal or sergeant" , "eg RSM" , "lancejack, say" , "eg Corporal" .)

I've seen this clue in The New York Times.
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