The captions say, from top to bottom:
- Fritz Schuster
- Oath-taking on 3 March 36
- Break during drill exercises on the school yard, also called blood-field
- After breakfast on 6 January 37
- Shoveling snow on 14 February 37
- As a memory to your brother [signed]
- Construction site - forest on 7 February 37
- Landscape photograph of the Heisterber Weiher [should be "Heisterberger Weiher", see notes below.]
- My Time of Labor Service Duty from 1 Oct. 36 to 24 March 1937, Abteilung 7 - Gruppe 250 - Gau XXV
- Squad photograph on 4 October 36
- Driedorf in winter
- The camp
- Cleaning the quarters on 14 February 37
- Sunday break on 22 February 37
- Tearing off the calendar page from 4 to 5 February 37
- Squad photograph on 7 November 36
The Reichsarbeitsdienst [= National Labor Service] was organized into Arbeitsgaue [= Labor Gaue] which were subdivided into Gruppen [= Groups] to which in turn were subordinated the Abteilungen [= Detachments, roughly equivalent to an army company].
This man was in Abteilung 7 of Gruppe 250 of Arbeitsgau XXV.
Arbeitsgau XXV was called Hessen-Süd [= Hesse-South] with its headquarters at Wiesbaden; it controlled Gruppen 250 - 258.
(Useful lists of identified units can be found at: RAD-Abteilungen
and RAD Reichsarbeitsdienst )
Driedorf, referred to in the captions, is a community in the Westerwald in Hesse.
see: Driedorf - Wikipedia, the free encyclopedia
The Heisterberger Weiher [= Heisterberg Pond], also mentioned in one of the captions, is a pond with a recreational area located to the southeast of Heisterberg, which in turn is a part of the community of Driedorf
see: Heisterberger Weiher - Campingurlaub - Baden - Gemeinde Driedorf - Lahn-Dill-Kreis - Hessischer Westerwald
That's all I can think of. Sorry, I cannot help with an approach for finding more info on this specific man.