Somebody knowledgeable person needs to publish a list of tips on how to recognize a suicide bomber. Some of the ones I have heard of are guys wearing white burial shrouds under their outer clothing, smelling like frankincense and murrh, and yelling Allah Akbar before they detonate. If you see the above, go for a head shot.
And purportedly freshly-shaven, all over.
Recognizing Imminent Danger: Characteristics of a Suicide Bomber
http://www.emsresponder.com/article/article.jsp?id=1916&siteSection=15