Realistically enlisted folks would know they have volunteered to give up their life for their country. Objecting to the "science" of every infection, plague or allergy they'd get would seem petty enough for a discharge or court-martial. It's the basic spirit of the service.
That said there have always been polarized elements in every country's military I'd guess. Regional, racial, religious and political differences wouldn't go away solely from a unified enemy force. IMO the current polarized climate has given more publicity to any objections to military, school and business life. Sadly, the US is certainly not the only country under pressure.
I think your comments are spot on for the majority who enlist or get a commission to serve I think that there is a underlying mental acceptance..I may have to give up everything.
For me,I was already a civilian contractor,temp assigned to Fort Knox, living in a rental house in Doe Valley,when I was told to pack my bag..could be,but luckily not going to a combat zone.
But Covid opened eyes to many, my nephew working in a Scottsdale Safeway,suddenly getting risk pay..before he was 18..people who process food,meat..suddenly in a combat zone..and in California..I still never completely wrapped my head around the criteria for essential worker designation.
I was able to cross from US and back and forth to Mexico because my boss wrote I was essential on a single sheet of company letterhead paper..was able to cross military check points in Mexico w a U.S. Issued Covid vaccine card and my utility bills from my Mexican residence.
And lots of food service workers were deemed essential..so if you are making grub..don't know if those folks start with the same set of mental parameters as someone signing up for military service..but it happened..and the people cleaning floors and bathrooms at hospitals most likely didn't classify themselves in a ultra high risk job,but the designation came almost overnight..seeing the over the top beyond complicated formulas..death,function,economic loss, infrastructure, emergency response,ect,ect,ect x100..there certainly never was not 1 size..what works in New Zealand doesn't work in New York City and what works in Lake Tahoe doesn't,couldn't work in dozens of urban Chinese cities..if you read a little..you see that apples to oranges comparisons are pretty common.
Dirts point about broadening immunity is lost on most, even though we live the model through things like supplements influenza for decades..you have some broad immunity..scientists guess on a strain for vaccination and given a mountain of variables..you can still end up getting the flu..the reaction to the exact same science from Covid..has been nothing short of dumbfounding..
And the US turns the sad corner of a million dead any day now