What the heck do I know about such things? I only held one of those though SBI for a little over 30 years.
Some were fun though, like on the very first one, I'd put as a reference the dad of one of my HS friends. I hadn't known that he was born in Canada and had Naturalized as a US Citizen via service in the US Army during WW II. The DIS dug into his background quite deeply. My friend's Dad asked me latter what the heck I was up to that required him to prove AGAIN that he was a US patriot. I could never tell him.
The vetting of me for my clearance may have been the most exciting thing to happen to some of my neighbors, friends and relatives.
On my last trip to my home area, people still talked about it and wondered what I did or wanted to do. That was 40 years after the vetting questions.