Here's what I've found out about my vehicles history so far....
The bumper markings identify it as 89MPGP (89th MP Group) 92P (92nd MP Battalion) 188P (188th MP Company) X-46. After its reassignment, 720P (720th MP Battalion) B-46 (B Company vehicle #46).
"In July 1970 when the 188th MP Company and B Company, 720th MP Battalion were redesignated and switched assignments in IV Corps Tactical Zone in the Mekong Delta Region, the Armored Commando Car V100 X-46 became B-46. With B Company it served as a backup vehicle for highway security and convoy escort. Its history after the 720th MP Battalion left Vietnam in August 1972 is unknown. Somehow it eventually made it back to the U.S. and was believed to have been used as a range target and supposedly purchased as scrap along with a sister V100 that's now in Texas".
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Here are pics of the completed repair on the two exit wounds on the left side. I used 4130 CM steel and bent the radius to match. After some primer, I can't even tell where I cut and welded the patches. It's perfect.