These chaps are wearing the Geländesportanzug with no insignia other than the cloth diamond on the sleeve which means that they are attending a course at a leadership school1 (Führerschule) - most likely a Bannführerschule as they look quite young. The training staff wore the same but they had the district triangle above the diamond. I think that the HJ armband was worn by trainees at the WEL
1Dienstanweisung für die Führerschulen der HJ. Published by the RJF in 1938