Not sure what would cause a local born and US Combat Veteran Soldier to consciously decide to study Islam and pledge allegiance to the Islamic State, but this ideology has spread throughout the world.   IS has established a following on every continent (Antarctica the exception). There's IS terrorists involvement in the US, SA, Europe, Africa, Middle East, Asia (Philippines, Indonesia) and recently discovered strong IS sympathizers in Australia. Their ability to recruit worldwide on social media and other methods is amazing being that they appeal to a new generation that really have no loyalty to the country of their birth or national origin; especially the younger crowd who are searching for a purpose in life and are not satisfied with the politics, religion and direction of their country.   Islam is driven to destroy countries and the people of Judeo-Christian faith among other non-Islam believers.   We will become the playground of what’s happening now in the Middle-East.   RESIST!!