Hmm...that vehicle reminded me of one I only saw briefly.
This was in 1968 in the month I was discharged from the Army.
It was a tracked reconnaissance vehicle that carried 3 crew. Driver, Navigator/Commo Operator, and Gunner.
The gunner used a top mounted M2 in a turret that could be rotated 360, sighting out small ports with a sight mounted under the barrel...he basically sat under the gun.
I didn't see the specs or do more than sit it one, but it was said to have a top speed of 70 mph on open terrain. That may have been the classified speed.
We got two of them into HHC of the 3rd Inf Div.. One had a turret that was rotated with manual cranks and the other had the turret electrically rotated.
I recall it was called the Shillelagh, as in the Irish fighting club, but I don't know any other name for it.
I've not been able to find any information on it and was wondering if anyone here might know something about it?