This 4×4 1954 IH was specially ordered by the Army Corps of Engineers for the Chief Engineers of the Minuteman Missile System in South Dakota. Just five were made, and three are known to survive.

The Minuteman Missile Program required vehicles like the R140 for accessing remote silo sites during the Cold War. With its full bus-style “Woody” body, seating for six, and ample cargo space, this truck played a key role in supporting the construction and maintenance of the missile system.

 https://silodrome.com/international-harvester-r140-4x4/