According to a few articles, the pool of people willing to take on suicide missions is too damn high: http://www.dailymail.co.uk/news/article-3092635/ISIS-fight

According to a few articles, the pool of people willing to take on suicide missions is too damn high: http://www.dailymail.co.uk/news/article-3092635/ISIS-fighters-complain-not-chosen-blow-suicide-missions-leaders-friends-family-waiting-list.html http://www.dailymail.co.uk/news/article-3092635/ISIS-fighter... (although it doesn't talk specifically about US)