MGR-1 Honest John
The MGR-1 "Honest John" rocket was the first nuclear surface-to-surface rocket in the US arsenal. Designated Artillery Rocket XM31, the first such missile was tested in 1951, and deployed in January 1953. The designator was changed to M31 in September, 1953 and were deployed in Europe several months later.
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. The rockets were originally outfitted with a W-7 dial-a-yield nuclear warhead with a yield of up to 20 kilotons, and later a W-31 warhead with a yield of up to 40 kt.
There were two versions, the MGR-1A and the MGR-1B. The MGR-1A possessed a range of 48 kilometers, a takeoff thrust of 400 kN, a takeoff weight of 2720 kg, a diameter of 580 mm and a length of 8.32 m. The MGR-1B possessed a range of 37 kilometers, a launch thrust of 382 kN, a launch weight of 2040 kg, a diameter of 760 mm and a length of 7.56 m.
Production of the MGR-1 and variants finished in 1965 with a total production run of more than 7,000 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.