Military tenants - logistical questions

[Amanda H.]

First timer landlords here, so sorry if this question is dumb. I spoke to a very nice lady who is interested in our rental home (our personal home currently). Her husband is career military and will retire soon. She moved herself and her kids back to our town to be near her ailing father, her husband will join later this summer. Being that he is over 18 and will occupy the house during the lease term, we should still require he submit to our background check (and pay the application fee), correct? At what time is he added to the lease, when he arrives or at initial signing? I'm just not sure how it works when one party is out of state.