Naval Supply Systems Command, in cooperation with the U.S Postal Service, Military Postal Service Agency, and Joint Military Postal Activity, has released mail-by dates for pre-Dec. 25 deliveries of holiday cards, letters, and packages. A list of the mailing deadlines is available on the U.S. Navy website. Customers should check with local civilian or military post offices for information regarding size restrictions and customs declaration form requirements. Mailing restrictions apply, and some items cannot be mailed. Customers should ensure articles are packaged properly for mailing and packages do not display markings related to any type of hazardous material.