I had always been short of half tracks with mortars for my US forces. I had hoped that the Hasegawa M4A1 version would have met my needs (link) but I couldn't face getting any more. Gradually I found a couple of diecast M21s at reasonable prices (thanks Bob) Then they appeared cheaply on ebay so I bought a couple more so I could replace my two existing models. They needed repainting to match and crew added.
The crew are from the Plastic Soldier US sets, which I had spare. The old vehicles will go on ebay in the new year