Military divorce and SSI

What is the name of your state?Wisconsin
My brother in law is retired from the Army receiving an army pension and has recently applied for SSI disability due to health problems. My question is 2 fold. He and his wife were married and divorced once during his career so there was not 10 years of consective years of marriage during his service. #1. Is she entitled to part of his military pension? and #2. Since they are not legally separated, although they have lived apart for 3 years, will she be able to claim money from his SSI in the event of a divorce?

This is confusing. Were they married and divorced while he was in the Army, then remarried and separated since retiring?
SSI is supplemental security income, it is needs based and not social security disability they are too different things. Does he have disabled vet status?
The divorce decree should state the settlement insofar as pensions. He has only applied for SSI/SSDI

They were married for 6 years while he was in the service, divorced and then remarried for only 4 years prior to retirement. The disability is not service related, it is a medical disability. They have not applied for divorce or even a legal separation. He lives in Wisconsin and she in Georgia.