You can add sections to your current membership at any time during the year by using our pdf membership form.  Indicate that you are a member and find the section you wish to add. Mark the appropriate section and type of membership (ie full member, student, etc.) You can pay by check (send it with this form and your name/address info) or you can fax the form back to 703-528-3546 if using Visa/Mastercard or American Express.