My sister married a doctor, and he is away for about 80% of the family time. I don't know if there is a "Right" and a "Wrong"...but more involvement from the father is better and healthier for the child, in my opinion. While he is away, perhaps you can arrange for daily web-cam talks or phone calls at least. You can help forge a connection between your husband and your children, but he needs to value it as well.