Not a legal answer but a practical one: He might want a contingency plan - drop-in childcare if available on base or an individual who is qualified and can babysit on short notice - so he doesn't get into trouble with his command. Since paperwork is generally required for childcare services, he should have it set-up in advance even if he never has to use it; it demonstrates his responsibility as well as takes some of the stress off him - and even creates and objective paper trail.