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All answers having "Military unit" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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ARMY



5 Character Answers:

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CADRE

CORPS

SQUAD

TROOP



6 Character Answers:

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LEGION

OUTFIT

PATROL



7 Character Answers:

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BRIGADE

PLATOON

REGIMNT



8 Character Answers:

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REGIMENT



9 Character Answers:

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ARMYCORPS

BATTALION

REARGUARD

TASKFORCE