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All answers having "Marine" as clue:

3 Character Answers:

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SEA



4 Character Answers:

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ALGA



5 Character Answers:

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CORPS

NAVAL



6 Character Answers:

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AIRMEN

GYRENE

REMAIN



7 Character Answers:

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AQUATIC

OCEANIC



8 Character Answers:

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DEVILDOG

NAUTICAL



11 Character Answers:

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LEATHERNECK