Some men simply don't believe that child-rearing is part of their responsibilities. They see their role as provider, the 'man' of the house, and anything related to the domestic scene - including children - is the 'woman's job'.
Of course, this is not acceptable, and you need to have a serious talk with your partner.
Try finding neutral ground - a restauarant over dinner is good, prevents raised voices!
Explain to him that you are a couple, and you worry that he is missing out on your children's development - this will avoid the viewpoint of criticism, which will simply send him into a sulk.
Best case scenario is he is simply following the pattern he learned from his faher, or his colleagues, but that doesn't help you. Just because he is a soldier does not mean he can exempt himself from family life.
Have a good talk - reassure him that you love him and see your future together, but that he is missing a seriously enjoyable part of life with youo and the children - and let us know how you get on.
Good luck.