Help to ID Soviet Shoulderboard

[Prometheus]

Hi, :)

new here, but I have been collecting bits and pieces of Soviet Militaria, shoulderboards, patches, medals etc... the only complete uniforms I have in my collection is a Sr. Sergeants paratrooper uniform from the 70s, complete with the badges, and a Enlisted Soviet field uniform from the Soviet-Afgan war. being that I was a Sergeant First Class in the U.S Army, I like to collect enlisted uniforms, and attachments rather then officers. Recently I bought a set of shoulderboards that has me stumped as to what it is. The color is royal Blue to denote state security, but the lettering is what is stumping me. I know that it isn't the Kermlin Guards. that would have ГБ with gold strips on the edges. so what shoulderboard is this, and what troops wore it? thanks.