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All answers having "Noncommissioned officer" as clue:

4 Character Answers:

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CORE



5 Character Answers:

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INDIA



6 Character Answers:

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PIRACY

PRIVET



7 Character Answers:

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ENDUSER



8 Character Answers:

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CORPORAL



13 Character Answers:

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SERGEANTMAJOR

STAFFSERGEANT