Sending a holiday gift to a member of the military? You'll need to get it in the mail soon.

The U.S. Postal Service's website offers dates for each kind of package and service receiving the mail — and it appears Dec. 16 is likely the latest date people shipping to service members will want to get something mailed if it's for Christmas. 

The USPS offers a Military Care Package Kit with guidelines.

 "To send packages to loved ones serving in the military and diplomatic posts abroad, the Postal Service offers a discounted price of $17.35 on its largest Priority Mail Flat Rate Box," the USPS website says. "The price includes a $1.50 per box discount for mail sent to Air/Army Post Office/Fleet Post Office/Diplomatic Post Office destinations worldwide."