The United States Army has rules and regulations for members of the Armed forces. Among those sacred rules is that men must shave and no beards allowed. Of course, in many armies of the world, men do not shave. In the history of the US armed forces, men went without shaving and we still won wars. Most Rabbis in the Jewish religion wear a beard. They even wear a Yamulka to cover their head. I realize these terrible breaches of the military code of behavior will result in untold hampering of our ability to kill the enemy.
Of course, most Muslim militants have beards. I guess the reason for not allowing Rabbis to wear a beard is to prevent our soldiers from killing them. The Army finally broke down and said wear the damn beard. I predict this change will not result in major losses in any war.