Deadline for shipping a box to an APO address for Christmas delivery is Dec 17, according to the Post Office, but that is for delivery by Christmas Eve, and doesn’t allow for glitches along the way. To make sure it’s there on time, ship earlier. To give recipients time to enjoy gifts such as holiday decorations before Christmas, ship as many days before the 17th as you want them to have your box. Ship now and they can hang tinsel on the Thanksgiving turkey; ship mid-Nov and they’ll put your Santa up on Dec 1. A wreath shipped Dec 1 can be hanging mid-month. Our church will ship early in Dec, a little later than I’d like, but we’re also filling shoe-boxes for Operation Christmas Child, and we don’t want to walk on that collection. Any date after mid-Nov works fine. And you don’t have to wait until all your boxes are filled…they can go as you have ‘em ready.