Brief bit on Flynn/Uniform Military Code & Article 134 is mentioned. ??

[The Polack MSgt]

12. The Army Judge Advocates General office can review the character of Flynn's service

And make recommendations to the DOA and DOD for their action.

The Army called back a General Officer to attempt to Court Martial him for sexually abusing his daughter, but it was disallowed because of the statute of limitations. That General is currently awaiting trial in VA which has no statute of limitations for rape.
https://www.armytimes.com/news/your-army/2018/12/10/retired-army-2-star-arrested-in-virginia-on-rape-incest-charges-that-were-dismissed-by-military-judge/

So it is possible for him to be recalled to face Judicial or Non-Judicial Punishment.

Short of that - it is also possible for the Army to decide that his service after a specific time was not honorable and roll back his retirement benefits to the last honorable term of service.

For example, If they find he began working as a foreign Agent as a Major General but decide that they could not successfully Court Martial him for this offence, they may administratively reduce his retirement to a Brigadier or Colonel's rate.

But I wouldn't get excited -The DOD almost never goes after of people who commit crimes after they retire - UNLESS it can be proven that criminal activity occurred while in the Service.

I know a Senior NCO serving time for distributing Meth that is banking his $42k pension for the 3 years he sits - He was an asshole when I knew him, but he didn't become a felon until after he popped smoke