A: Yes. However, items that weigh less than 16 ounces and do not have potentially dutiable contents do not require customs forms.
For information about customs forms, go to:
http://www.usps.com/international/customs.htm#H1.
For information about APO/FPO forms, go to:
http://webapps.usps.com/customsforms/sender_recipient_APO_FPO.jsp