What do we need to have discussed before baby arrives?

My husband is in the millitary and is being sent to Afghanistan for 6 months from September. I'm 4w 4days pregnant so chances are he'll be away for the birth as it's very unlikely he'll be sent back early. I know it's bad timing but we've been trying for 7 months so we're still counting out blessings.

I just wondered if anyone has any advice on the things we need to discuss/decide before he goes. We've already decided if we want to find out the sex of the baby and he's said he's happy for me to make any decisions I need to if they need to be made quickly or I can't contact him but I'd like to involve him as much as possible so anything we can cover early, I'd like to.

I'm in the UK and don't live on camp (not sure if this will make a difference).