How does DFAS calculate the 10 year marriage: is it by day or by year? If DFAS goes by exact date, then I’ll miss the 10 year overlap vs retirement by 52 days.
I believe that any organization, including DFAS, will measure timeliness requirements exactly. In other words, one year is from one day date to another day date a year later. If you miss a required timely option by 52 days you may appeal but it's my experience that timely requirements are strictly enforced.