The Soldiers know what they sign up for, and if you've never been scared for your life in a combat zone, I'd argue that you lack the perspective to that claim.
If a Soldier doesn't feel comfortable with their mission, they have many ways of dealing with it that do not involve being gagged by their superiors.
I don't understand what kind of experiment that could be, unless they're forcing specific couples to have children.
Are you sure you're using the word eugenics right? You're not just trying to say 'nazi' without using the word 'nazi', surely?
It seems perfectly reasonable to call that "[a] scientific stud[y] that border[s] on eugenics".
I don't really buy it. I think the army would want test data for all races. Contaminated agent orange for people of all colors.
FWIW in most contries soldiers are fodder for other purposes beyond fighting wars, sometimes are subjects in scientific studies that border on eugenics crap that everyone knows of.
For what I would say - friends don't let friends join an Army.