If it were during any time when a war like either WW's, Vietnam, or the Iraq/Afghanistan wars I'd probably do everything I could to steer them away from it or negotiate as safe of a branch as possible for them. No! No, water purification for you! Haven't you seen In the Army Now? Then every night that they were deployed afield I'd get another gray hair. But whatever they decided on, I'd support them 100%. Once someone has made up their mind, trying to change it will only push them away and not get you anywhere for it.