While I usually agree with Mr. Rafter, I disagree that custody impacts ability to remain in active duty. Most of the times, this does not. I have several clients who are active duty military with custody of their children. Custody is impacted when the service is deployed but in that case, it is possible to make alternate arrangements if the other parent is not fit.
DOD Directive Directive 1342.17 requires Family Care Plan--failing to have one, show one, or be able to execute a Family Care Plan is grounds for administrative separation. That is why I offered that it 'may impact his ability to remain on active duty'. http://www.dtic.mil/whs/directives/corres/pdf/134219p.pdf
Agreed - the family care plan is important - especially with new recruits.