I would say that if originally custody belonged to the other party and was awarded to you through court order then you have little to worry that it will be changed back. Especially with “minimal involvement”. With “minimal involvement” it will be difficult for a parent to show that it’s in the best interest of the child to remain in this state with them. The parent with primary custody moving, especially given that it’s military station and not by choice, should not affect the order if this is the only “new” reason to file.
I believe that normally long range visits like this would be whatever you would agree to. The court could set it up, but it would be easier to come to some agreement on your own through mediation.
I’ve read 3-4 weeks in summer and both spring and fall school breaks…alternating holidays and splitting the cost of travel expenses. I would suggest that the parent receiving the child pay for expenses that way the other parent doesn’t feel as though they are paying to send them away. And this arrangement could go a long way with allowing the other parent to make the call about how often they take advantage of visitations. You could also take into consideration the child/children’s wishes on visiting during this.
Child support could have an impact on custody but they are separate issues. The ability to support a child does not have much to do with a parent’s right to visit the child or their ability to care for them.