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All answers having "General assembly?" as clue:

3 Character Answers:

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WAR



4 Character Answers:

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ARMY



5 Character Answers:

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BRASS

STARS



6 Character Answers:

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BATTLE

FSTARS



8 Character Answers:

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PENTAGON

TOPBRASS



9 Character Answers:

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FIVESTARS



10 Character Answers:

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CADETCORPS



11 Character Answers:

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HIGHCOMMAND