The Valkiri entered service in 1979 and was first used in combat in August 1981 during Operation Protea. Wikipedia's Valkiri article gives the Mercedes-Benz Unimog as its carrier, and the Unimog-mounted launcher is the better-documented version; the SAMIL 20 launcher rests on the Jane's 1985 listing and Military-Today, and no dates for it are published.
Research status: draft — identification, dates or figures could not all be pinned down; the summary says what is unresolved.
Catalogue fields describe the vehicle's structure and body as this registry records it. They are not certified factory measurements, and no performance figures are published here.