One of the more unusual, but exceptionally capable small military tactical trucks out in the wild is the Steyr Puch Haflinger. There were quite a few different models and variants, both military and civilian.
Air cooled, four wheel drive with fully lockable differentials, available crawler gears, and a well designed body make it a nice little work horse of a vehicle.
I’ve owned an ex-military Swiss model for some years now, a 700AP. Which is pretty much a standard Swiss Haflinger, nothing really unusual about it. I’ve done some mods – tires, ignition, wiring, and other bits and pieces. But in general it’s a stock model and I’m planning on keeping it that way.
Capabilities? Well, you often see these little trucks tagging along behind Unimogs and keeping up quite well with them, at least until you start getting into deep water.