What do you say when someone thanks you for your service?

My husband hasn't even left for basic yet (he leaves in Jan.).. he's only in DEP.. but when i was calling to get some quotes and they guy found out that my husband joined the Navy and he just kept thanking me. (for my mine and my husbands sacrifice) I didn't really know what to say... what would you have done in that same situation AND for future reference, what do you say when the thanking is actually applicable?