Earlier quoted context omitted.
>he has been adamant that vaccines are incredibly important for the military and the policy changes have really angered him, specifically because of the damage it does to readiness. Your friend knows his history; disease has been the leading cause of death in warfare, historically, killing more soldiers than actual combat.
Did we ever get a vaccine for trench foot?
However, we did receive a lot of training in how to avoid and treat it, along with better equipment. Does that count as a “vaccine”?