In the overwheming majority of the times that is not the case. Usually, techniques can be modified well before that happens and lessons can be learned of how to better employ resources. But yeah, sometimes when trying new things bad things happens. It might surprise you that there a lot of people that enjoy taking those calculated risks. That is why re-enlistment rates have always been higher during times of war than peace. Re-enlisted during peace time is a much safer strategy but people are more likely to do it during times of conflict. Most think that is because the higher risk is worth it because they seek the adventurous life that comes from taking risks in order to accomplish something good.