Another one of my US Army Cold War supply units. The Gamma Goat served in the US Army for about 20 years, from about 1969 to about 1989. It was a very loud vehicle, but it could go almost anywhere; it could even swim, a little.
Gamma Goats had a cargo and a shelter version. The shelter was usually some kind of communications gear.
The little tan vehicles are the M114. It is like a mini-M113. They were used for reconnaissance in the Cold War. The concept was that they would replace the Jeep. A small unarmed vehicle was not suited for Atomic Warfare.