Saw this from a highly reputable and reliable source, but only in photographs.  What insignia is it, and can anyone translate the (Russian) Cyrillic?

I used a translation programm and the result was: "graduate"

I came up with:

воспитанник: student, pupil.

 

I did come up with this source, from pages 345-346 of the book pictured below:

 

"In addition to fifty, or so, thousand Russians  drafted into the Luftwaffe's Flak defenses from early 1943 onwards... Russian youths, male and female, between the ages of 15 and 20, were conscripted for the same task by the combined efforts of the Hitler Youth - ᛋᛋ - Luftwaffe from March 1944 until the collapse of the Reich.

 

The Statistical Department of the Hitler Youth lists the Russian component  of these "Flak Helpers" as 1,383...

 

The Russian boys wore this brassard...☆  Above this they wore ᛋᛋ runes in a white on a black triangle (all non-Germans were supposed to wear this...)"

☆ See the first image, right arm from the viewer's viewpoint