BM-21 Grad
BM-21 Grad is a multiple rocket launcher or combat vehicle model.
Also recorded as BM21; Grad; Combat Vehicle 21; M-21 Field Rocket System; M21; M1964.
Overview
Multiple launch rocket system family of Soviet origin.
In detail
It is associated with Soviet Union. The record gives 1963 as its date of establishment or first appearance.
Sources
Each source is named with the standing the house places on it, so the evidence can be weighed rather than taken on trust.
reference work · Reputable secondary · Wikipedia
“BM-21 Grad”, English Wikipedia, consulted as further reading
Consult the sourcereference work · Reputable secondary · Wikidata
Wikidata, structured authority record Q270289: BM-21 Grad
Consult the source