As far as I know, this one-man tank never left the mind of Les G. Scherer.
Scherer designed this personal-sized tank to weigh 7,000 pounds, pack two .30 caliber machine guns, and have 650 ports arrayed around the driver with each port containing a shotgun shell that could be electrically fired. Main selling point of the Turtle Tank was its low center of gravity. Like its terrapin namesake, this tank would have been difficult to turn over.
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Source: Popular Science April 1952