That looks like a Ford Kiddie car as some Sherman crews called then, or the official Army designation was an M8 also called the Greyhound Armored vehicle by some so it's not even a tank by any means.
It's a light weight support vehicle that my dad, an M4A1 Sherman driver used to call the Ford Kiddie car.
It had no real armor protection and only a short range 37 mm main gun and no real armor that afforded the crew any chance of surviving anything that the enemy had in light armor or medium arms.
They were mostly used for command vehicles and also for front line scouting in areas that were known to have no German armor nearby and as a result of its command vehicle uses the M8 would have had a long range HF radio in addition to having the short range FM radio which was the same radio that the Sherman's, Grant's, Sheridan's and M26 Pershing's used so a CW operator with a leg key would not be unusual in that vehicle.