“They are the Islamic State group’s elite shock troops. Fanatical and disciplined, they infiltrate cities of Iraq and Syria, unleash mayhem and fight to the death, wearing explosives belts to blow themselves up among their opponents if they face defeat.”
“IS calls them “Inghemasiyoun,” Arabic for “those who immerse themselves,” a sort of special forces unit parallel to its regular forces that is credited with many of the group’s stunning battlefield successes. A recent online video from the group showed a unit preparing to launch an eventually successful attack on the central Syrian town of al-Sukhna. “Victory or martyrdom,” the fighters, wearing blue bandanas, scream in a circle around their commander, pledging their allegiance to God and vowing never to retreat.” (Coordination Center)

http://news.yahoo.com/secret-success-shock-troops-fight-death-065509636.html