There have been several high-profile arrests of wannabe jihadis who allegedly intended to fight with the Islamic State group, including three New York City residents last week, charged with providing "material support and resources ... to a foreign terrorist organization." They each face up to 15 years in prison.
Over the last year the United States has intercepted and arrested at least 15 young Muslims for wanting to join Islamic State.
If I went to Syria to join Islamic State, I could be arrested and charged with felonies that carry long prison sentences.