XM808 was a proof of concept vehicle created without requirement by Lockheed Missile and Space. Three were built for the Army for testing for lunar operations, the fascinating armed and armored version is found today at the US Army Armor and Cavalry Collection, Ft Benning, GA.
Thanks to the ACC and the Patreons for making the trip possible.
ACC Facebook Page: https://www.facebook.com/ArmorandCavalryCollection
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I may not have been entirely serious about the lunar operations bit.
The Chieftain (Real name Nicholas Moran) is Wargaming America's resident tanker and amateur historian.