My advice to you is do not get caught up in the chaos and just enjoy each other's company. My youngest son is in the Marines. On the rare occassions when we get to see him, one whole day is just dedicated to talking, relaxing and catching up. Sadly he will not be home for Christmas this year. His first Christmas away from home completely.

He had a choice to have 6 days off and come home during Christmas or get 8 in January. His father and I only get Christmas day off, whereas after Christmas we can both take time off to spend with him while he is here. My mother is mortified! She cannot understand why he decided to come home later. My point to this is that the "holiday" is the time we spend with him, not a specific day of the year. I know its easier said than done, but enjoy the time you have with him. Try not to dwell upon what it will be like once he's gone. You'll cross that bridge soon enough.