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All answers having "NCO" as clue:

3 Character Answers:

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CPL

SGT



4 Character Answers:

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CORP

MSGT

SERG

SSGT

TSGT



5 Character Answers:

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LOWLY

SARGE



7 Character Answers:

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NEPTUNE



8 Character Answers:

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CORPORAL

SERGEANT

SOUVENIR



13 Character Answers:

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LANCECORPORAL