Before addressing this particular question, I do want to point out that my opinion as stated here, still remains largely unchanged. With that context out of the way, this AQ.
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No, the title of Hussar is used for Ministry of World Assembly Affairs (or whatever it is called now). This would immediately render it constitutional, in my opinion.
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Signing up to be a Registered Voter still wouldn’t be unconstitutional, maybe by the fact that voting in of it self is a responsibility. In addition, there are several roles you can only hold if you are a Registered Voter (ie Delegate). I think there was even an initiative that in order to be in government at all you had to be a Registered Voter, so there is more than just A Random Title Hereby Granted To Someone:tm:
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While they are a soldier, sure. Give them whatever title you want as long as it is tied to them being a Solider or maintaining X requirements to have such an epithet. On the other hand, after retirement, that would enter a grayer area, unless it’s an Award for Service like we already have for Valor or for Merit or even Golden Ocelot. It would depend on it’s context