Yup

https://www.defense.gov/Contact/Help-Center/Article/Article/2746328/use-of-military-rank-by-retired-military-members/

And here are the examples of what’s allowed. https://www.rallypoint.com/answers/what-is-the-correct-way-sign-ret-as-part-of-your-signature-after-retirement

An (R) like this traditionally means you’re a Republican.
Like much of everything else that we have witnessed as a proof there tends to be something injected into whatever it is that is intentional to keep some ppl questioning. I personally believe this is done to slow the progression of the Awakening as too keep ppl from all agreeing at the same time and having a uniformed meltdown..

Yup

https://www.defense.gov/Contact/Help-Center/Article/Article/2746328/use-of-military-rank-by-retired-military-members/

And here are the examples of what’s allowed. https://www.rallypoint.com/answers/what-is-the-correct-way-sign-ret-as-part-of-your-signature-after-retirement

Yup

https://www.defense.gov/Contact/Help-Center/Article/Article/2746328/use-of-military-rank-by-retired-military-members/