I have a couple of photos of the yard where the army place 700 to 800 halftracks back in 1990. The halftracks were loaned to the french and were returned when they wanted to dispose of them. The yard is in Germany (need some army help on lacation), it is a tank range. The halftracks were to be used as hard targets. All the halftracks look to be rebuilt, winch model M16s.
PS, I am going on my old mind, so the number could be 400 to 600 halftracks....
One of the few, Frank USMC RET