I could argue the opposite. If your purported "exception" applies to 80%+ of the global population, a minimal dash of common sense would make me think that's the rule, not the other way around.
OK, don't answer that, I did my own research[1] and from the Western democracies that have mandatory military service there are: Finland, Norway, Sweden, Denmark, Austria, Greece and Estonia. They're more than I expected, and overall, including less democratic nations, there's a total of 66 (out of 194). By population it's even less, as none of the top countries except Brazil and Russia have mandatory service.
So overall that's very much less than 80%, but definitely more than I was expecting.
Just so there isn't any doubt: I dismiss your initial theory that somehow the response to the Corona virus is a violation of anyone's bodily autonomy.
My whole thread here was about trying to understand your reasoning, and perhaps make you understand mine, but instead of helping me you refuse to engage in good faith so I'll stop here.