216.66—Who is an employee's surviving divorced spouse.
An individual who was married to the employee is the deceased employee's surviving divorced spouse if he or she:
(a)
Was married to the employee for a period of at least 10 years immediately before the date the divorce became final, and applies for an annuity based on age or disability; or
(2)
Was married to the employee at the time the employee or the surviving divorced spouse adopted the other's child who was then under 18 years old; or