M2 half track with 2x triple M8 rocket launcher. Don’t know if there were reload rockets in the hull.
M20 AUC with a 75mm recoilless rifle instead of the .50 cal. This should’ve been the event vehicle instead of the mass-produced M8 LAC.
XM723 MICV, the predecessor of the Bradley. Would be similar to the XM800T but with a larger hull and the option to mount a TOW launcher on top of the turret.
Honestly, It’s a very obscure thing to find any information on. Only thing I know for certain is that it was used as a firing trial and that it apparently did pretty well in that role. It did not test fire the mgm-51 shillelagh because it was not ready at that time and they needed to get started on the firing trials.