Only YOU can answer that question.

You're out of college, and over 19 for certain, so you must be old enough to assume the liability for your actions.

There is no law of the 'real world' that says anyone MUST belong to any civil organization. Only you can consider and determine just what might happen if your model goes into a near-by street, causes a driver to swerve, a wreck happens and you are held responsible because you failed to control your flying machine.

Long ago, the Supreme Court determined that Airline Pilots could be held accountable for any mistakes they made that resulted in loss of life or injury. What would you think the civil courts could do to someone that failed to take due diligence with his/her toy airplane?

Your call.[X(]