I once knew a person who had their security clearance yanked based on concerns over their financial stability. The person was a valuable asset to the organization and an unquestioned patriot, but they were really serious about security investigations back in those days. Not so much now.
I worked in an organization that had this E5 female that married this ‘idiot’. She was bright, clever, and very financially astute. Two years later, the ‘idiot’ had bankrupted the pair.
So, she’s in Intel. She’s got the TS-ticket. She goes to off-base legal and they tell her to declare bankruptcy...simple and easy. She goes to base finance, and they say the same thing after the full story (she was going to divorce ‘idiot’ by this point). So she starts the paperwork and is just about ready to go final (stamped)...when someone in her office finds out and tells security. They go nuts. If you declare bankruptcy....you lose your clearance, period. Round and round this goes for ten days.
At some point, I ask her what the magic amount of debt was. Near $75,000. How ‘idiot’ got her that deep in two years was worth a 500-page book. In the end, she did the bankruptcy paperwork, lost her clearance, and ended up a clerk over at the base clinic.
I’d say in 30 years hanging around the military.....I’ve seen a dozen folks lose their clearance, and all of those were either money issues or alcohol.