Ranks | French Foreign Legion Information
https://foreignlegion.info/ranks/
Foreign Legion's ranking system is based on the French Army ... Caporal/Brigadier is allowed to receive that rank after a minimum of 6 years of service, Caporal-chef (Brigadier-chef)

Caporal-chef
Senior Corporal - stopień
You have to address him: “Caporal-chef”
In 1er REC, Senior Corporal is called Brigadier-chef (a Cavalry tradition).
Caporal/Brigadier is allowed to receive that rank after a minimum of 6 years of service, if he do not want (or is not allowed) to continue as a Sous-Officier (a Non-Commissioned Officer, NCO).

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Note added at 10 hrs (2017-05-04 07:33:38 GMT)
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wojskowy stopień 4. => podoficerski

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Note added at 10 hrs (2017-05-04 07:34:09 GMT)
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W policji odpowiednikiem tego stopnia jest sierżant Policji
https://pl.wikipedia.org/wiki/Starszy_kapral

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Note added at 10 hrs (2017-05-04 07:39:46 GMT)
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https://joezieja.com/2012/08/18/military-in-fiction-6-rank-a...
3.) Echelons. When I use the term echelons, I am partially referring to the “chain of command” and partially referring to how an effective fighting force is organized. As with all characteristics of militaries, yours might vary anywhere between having no echelons and having hundreds.

Let me pause to explain the chain of command, which will also help you understand echelons. The chain of command is the line you can draw from one person in the military all the way up to the highest ranking member. I, for example, am a member of a squadron, the second lowest echelon in the air force. The next person in my chain is the commander of my squadron, who is in charge of a unit (the squadron) of about 300 people. His boss is the commander of a group, comprised of several squadrons and totaling, perhaps, a few thousand people.
https://foreignlegion.info/ranks/

MARYNARKA WOJENNA RP NA RÓWNI POCHYŕEJ - Akademia ...
www.amw.gdynia.pl/library/File/new/RBM_2009_cz_2.pdf
Dla skutecznego zarz dzania polem walki wszystkie jednostki zespoáów siá ..... System logistyczny w nowej organizacji siá odpowiadaü b dzie innym ...... echelony. Echelony ró ni si pomi dzy sob wyposa eniem normatywnym oraz ...... 17 Polski odpowiednik tego terminu –

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Note added at 10 hrs (2017-05-04 07:40:41 GMT)
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page 214 definiton of the echelon

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Note added at 10 hrs (2017-05-04 07:40:53 GMT)
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(definition, sorry)

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Note added at 10 hrs (2017-05-04 07:42:32 GMT)
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echelon / rzut, szczebel, urzutowanie - urzutowanie pododdzialów jeden za drugim, Slownik terminów i definicji NATO