Question on Arbeitsdienst Unit

[OrangSoldier]

Hi there!!

I am trying to do some research on a unit of the Reichsarbeitsdienst/ on a specific soldier.
I have added a few pictures of him (he's the one with the portrait with helmet) / his unit, and I was wondering if anybody here is able to identify the unit numbers and what they mean? I do not even know his rank etc...
I did not know where to post this, so I decided to post it here.

His own shoulder patch says "91", and the shoulder patch of his commander says "233". I also have a picture of him wearing the "233" shulder patch.

Thank you for your help!

all the best,
0.S.

[Adrian Stevenson]

In Army uniform he wears the "91" of Inf Regt 91:

Infanterieregiment 91 - Lexikon der Wehrmacht

[HPL2008]

The RAD "233" sleeve insigne identifies personnel of the RAD-Gruppe 233.
The "233 / 1" one is for personnel of Abteilung 1 of said Gruppe.
(RAD-Gruppen 230 - 238 were subordinate to Arbeitsgau XXVII Thüringen [Thuringia]).

The rank insignia worn by the RAD officer in the first photograph are for an Arbeitsführer, Oberarbeitsführer or Oberstarbeitsführer (I can't tell the exaxt rank as the photograph is not clear enough to tell whether he has pips on his shoulder boards). Rank of the officer in the foreground of the second picture (is that the same man?) is Oberfelldmeister.

The rank in the two Heer studio portraits can't be told, but is definitely one of the private ranks. (To tell the exact rank - whether he is a Schütze, Oberschütze, Gefreiter etc. - we would have to see his left upper arm.

[Gwar]

I agree with the assessment by HLP2008, here is some additional information Arbeitsgau XXIII Thüringen, Abt. 1/233 Hilburghausen, Honor Name 'Berthold von Henneberg', the enlisted man's 'Dienstellenabzeichen' or arm shield I have attached for reference, the officer grade would be made with a silver bullion type thread.