Eleven-year-old Abu Imara al Omri kneels down to kiss his father’s hand; a final blessing before the boy blows himself up in a truck full of explosives.The disturbing goodbye was captured in a series of ISIS propaganda photos last month.Supporters of the terror group claim the boy was used to help take the village of Ghazl near Aleppo, Syria.But Omri is not alone. The use of child soldiers far predates ...