Rgl. No.

21:37 Oct 21, 2019 

This ST is a birth certificate.

the part about "Rank, and if a Soldier or Airman Rgl. No." is about identifying one the persons involved - one of the parents, or the "informant".

Although "Regulatory Guidance Letters (RGLs)" certainly does exist as a term, I can't see any imaginable scenario where a "RGL" Regulatory Guidance Letters would crash land in a birth certificate!

19:09 Oct 21, 2019 

Michael Confais sent this to me, I do not know why he did not send it here to the question:
"Entry from: Michael Confais
Regarding term: Rgl. No.
Language pair: English to French
URL: http://www.proz.com/kudoz/6722294
Entry: No title

\"Regulatory Guidance Letters (RGLs) were developed by the Corps as a system to organize and track written guidance issued to its field agencies. RGL’s are normally issued as a result of evolving policy; judicial decisions and changes to the Corps regulations or another agency’s regulations which affect the permit program. RGL’s are used only to interpret or clarify existing Regulatory Program policy, but do provide mandatory guidance to the Corps district offices. RGL’s are sequentially numbered and expire on a specified date. However, unless superseded by specific provisions of subsequently issued regulations or guidance, the content provided in RGL’s generally remains valid after the expiration date. The Corps incorporates most of the guidance provided by RGL’s whenever it revises its permit regulations.\"
https://www.usace.army.mil/Missions/Civil-Works/Regulatory-P...

Do not reply to this email. Click"

13:28 Oct 21, 2019 

I take that for an "l", so something about "Reglement"