At least three versions of the tractor are known to have been used. Designated HCM-1 through HCM-4, with HCM-2 inexplicably omitted, the vehicles were named in honor of Ho Chi Minh whose toll road was a major route used in transporting the missiles from their secret jungle manufacturing facilities to their deployment sites. It has been averred that "HCM-2" was not used because it spells the same word (in Vietnamese) as "SAM-2", but this is entirely speculation.
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