This is a USMC Mighty Mite. It is a post WWII Jeep type vehicle that the Marines used for a short time. It is smaller than other Jeeps and is kind of cute. No HO models of it that I know of.
This M151 was just like the ones we had when I was in the Army. Note the light on the fender is gree while the vehicle is camo. Note also the tires are oversprayed with paint. The average GI does not care much about perfect paint jobs. Spare parts don't always fit the color scheme of the new vehicle.