Overseas Visitation

I had no idea where to go with this question but I’m hoping someone can help. My husband is in the army and he has a two year old daughter. Let’s just say his baby mamma is absolutely crazy and childish. He hasn’t gotten to bond with her at all. He barely knows her. He gets pictures every once in a while. She usually has a meltdown over me (She hates me for some unknown reason. Even though I have never given her a reason to) He has tried previously to put her in the system but she refused to give him the paperwork necessary to do so. Anyways she will soon be in the system and he will have to pay child support. Me and my husband both are being stationed in Korea soon. My question is does anyone have any idea how visitation would work?