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The M31 consisted of a truck-mounted, unguided, solid-fueled rocket that was transported in three separate parts that were combined in the field, mounted on an M289 launcher, and aimed and fired in about 5 minutes.
Production of the MGR-1 and variants finished in 1965 with a total production run of more than 7000 rockets. The system was replaced with the MGM-52 Lance missile in 1973, but were deployed with US Army National Guard units as late as 1982.
See also:
http://www.designation-systems.net/dusrm/r-1.html
http://www.astronautix.com/lvs/hontjohn.htm
Surface-to-surface missiles