President is Commander of the military..and yes..they MANDATE vaccinations
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None of your response answers why mandating this particular vaccination is a good idea in light of the population cohort that is in the military. You also failed to answer why the insistence on mandating vaccines for those who have already acquired immunity thru prior infection. This goes against 200 years of understanding of immunization. No one would mandate a measles vaccine for those who have had measles.
Do you know for a fact that if you tell the army that you had measles as a kid they will then waive the measles vax?