So to shed light on “Fight club”- the “Charters” are not enforced like you would be led to believe. Since 9/11, most guys stay in Batt. Often in the same Batt, sometimes the same company, and occasionally the same PLT. When “charter time” came back about the time I showed up, it was a burden and a blessing.
If a guy wants to make E8 in Batt, he has to do something outside of Batt. RASP/RASPII/SURT cadre all count. RI fine counts- though most dudes Regiment wants to keep stay in house as either A)RSTC (prior mentioned courses) or B) gets a Cush job near their old Batt as a BLC instructor. The bad ones who need real time away or are not wanted back go be RI’s at Ranger school or go to the Big Army (not including the E9 level).
This all goes back to what @Box brought up- guys keep their MOS in Regiment. A tabbed infantryman is still an 11BV4. A commo dude is still a 25 series with the V4 identifier. It makes it easier for Regiment and the Army to keep tactically competent dudes around or send them somewhere else to be a stud, even if they are shitbags.
SEALs having a rating that essentially keeps them out of Big Navy prevents them from going there and being used as an asset. For instance- a Regiment medic who gets RFS’d can go to the 82nd and know what is up, honestly with SOCM be a better asset than most PAs, and continue serving. Albeit unhappily. But they can go take a job in the Army. SEAL medics can’t say the same.
I will say it’s not hard to get re-rated in the Navy or lose your rating. It’s just not common practice anymore. Though I’ve seen a Corpsman become undesignated Seamen, which I promise you. Is not a job anybody would want.
It’s just quite uncommon.