I don't ever remember having a choice about vaccines when I served. It's the military. Combat readiness and the mission comes before everything else.
You must be ready to kill someone in a country in Africa (pick anything here) because the govt said so. You know this when you join.
You can die there too, and you know that too. This is why I do not particularly care about the military kills in such a war until someone does not celebrate the same way the guy who killed himself serving in mountain rescue, to save someone else.