Vaccines aren't something you need urgently in a crisis.
A wartime effort has to keep supplies moving daily, or the front collapses.
Whereas the need for vaccines is heavily deferred - your population is already vaccinated in peacetime, and you are unlikely to need to make a novel vaccine over the course of a war, nor vaccinate new population during one either: that large vaccinated population providing herd immunity gives you a lot of runway for children with less access.
> Vaccines aren't something you need urgently in a crisis
.. what were you doing in 2020?
> you are unlikely to need to make a novel vaccine over the course of a war
The lab leak people are probably wrong, but in the present era we're a lot closer to "hook AI up to a CRISPR machine and generate a biological weapon" than we have ever been.
Everyone seems to assume that we might get in a war that we recognize and can fight with the tools of WW2, ships and tanks, rather than a war we don't recognize fought with weapons we don't understand and have no counter for. Or, more likely, simply get bought out at the top. Why fire a missile when you can buy a political party for a mere £5m?
you definitely want flu vaccines for your infantry, lest they get captured or killed en mass due to fever
on a similar note, medical supplies and logistics are a huge deal for going to war, to handle casualties