the search in Russian for "Блок памяти БП-20" leads to this

http://www.ngpedia.ru/cgi-bin/getpage.exe?cn=61&uid=0.381138...

which points to "АСВТ-М" series of machines used in all areas of economics, government, education, and military as well.

http://www.icfcst.kiev.ua/MUSEUM/PHOTOS/M-6000_r.html

Usually the military components would have "ВП" stamp ("Военная приемка" - "accepted by military QA") - at least that was the case with electronic components from torpedo and cruise missiles at the navy base hardware dump that we sourced our hobby electronics components from in the childhood, and this doesn't seem to have it :

http://sovietsouvenirs.com/catalog/images/ic/core_memory-15-...