The first use of the term Scud was in the NATO name SS-1b Scud-A, applied to the R-11 Zemlya ballistic missile.
Further developed variants were the R-17 (later R-300) Elbrus / SS-1c Scud-B in 1961 and the SS-1d Scud-C in 1965, both of which could carry either a conventional high-explosive, a 5- to 80-kiloton thermonuclear, or a chemical (thickened VX) warhead.