I've been out for decades, things have probably changed somewhat, but I think this is for a housing allowance and related expenses. I don't know if this is real

I've been out for decades, things have probably changed somewhat, but I think this is for a housing allowance and related expenses. I don't know if this is really the reason, but I've been told it's because a married service member is taught to be a more stable service member. Similar to the supposed justification for mortgage deductions, because owners supposedly have stronger ties to the community.