Should have put this comment here (posted it over there):
Father of a good friend growing up was a West Point Armor Branch O-6 (bird colonel) with 2-3 Vietnam tours. This in the mid-70s. He *hated* the Sheridan. There were still some of them around at Fort Knox in that era, more in Germany in the Fulda Gap.
From what I can tell, basically nobody that served in or with the Sheridan in any serious or significant capacity liked it. When all of the crew of your tank except the driver would rather ride on top of the turret so as to be better able to bail out, your tank sucks.