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All answers having "Troop group" as clue:

3 Character Answers:

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GIS



4 Character Answers:

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ARMY

UNIT



5 Character Answers:

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CORPS

FORCE



6 Character Answers:

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LEGION

PATROL



7 Character Answers:

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BRIGADE

PHALANX

PLATOON



10 Character Answers:

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DETACHMENT