Graduate assistants are not required to register for courses during the summer term. Graduate assistants employed in the summer but who are not registered for 4 credit hours during the summer term are subject to FICA and Medicare taxes. Registration is required for recreation center usage and on-line libraries. Enrollment of 6 or more credit hours will allow access to the health center without being charged a usage fee. Any student may use the health center if under 6 credit hours or if not registered, but will be charged a one-time fee to access services (for any term fall, spring or summer).