Step 1 : Introduction to the question "3. The National Guard has two missions: federal and state. Which is not a state mission?"
...1. Responding to a flood 2. Responding to a hurricane 3. Responding to a riot 4. Conducting overseas combat operations. The National Guard is prohibited from leaving U.S. soil to perform its missions. Only when called into Federal Active Service may National Guard member leave the U.S. to perform combat mission.