People in my reenactment group discovered this extract a few weeks ago and we had a go at recreating the system at our event this weekend. This was the end result.
Yours truly is manning the DP28 against the invading gitlerite planes.
10th NKVD GUVV Division
Leytenant Lyosha Nemtsov
"The NKVD, Bad men in colourful hats."