Husband might be gone for baby birth!

I am 29 weeks and my husband has been deployed for the last 2.5 years. He came home for r&r in November and that's when we got pregnant. He finally came home a little over a month ago and just found out they will be going underway all the time and will be gone during my due date and even close to it. I tried to reassure him that she could come early before he left but he is still freaking out and soooo upset. It's our first baby and I understand him being so upset and I am too but I get it. Any suggestions of what else I can say to help besides if he is gone I have family and won't be alone and we will tape it or skype so he could still see it. Just any suggestions please!