The Australian army tested anti-malarials with good intent and caused huge mental harms (they are pretty psychologically active and can trigger suicide ideation)

The US army has form for testing on recruits without adequate consent or information

Overall, the whole "for the good of humanity" story here is that the consent is weak, the support is weak, the costs are not borne equally. I would not advise any young person to be guilt-tripped into volunteering for this.

The track record here is very poor