Why is it, that during a war against a technolgically superior enemy, hell bent on destroying the human race, the UNSC didn't think to start conscripting citizens? The main evidence for there being no conscription is the recruitment posters all over new mombassa.
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ONI probably didn't want to break the imiage they had built up with porpagnda. Your Army is pushing the aliens off every world but we need more people so we are going o force you in. The United Earth Governmet probably couldn't deal with the blow back from the colonies when it was all over.