US Army did not adopt this variant. Marines don't use M113s either, they stuck with LVTP5s and 6s for Vietnam and LVTP7 varients from Mid-1970s to current. The fitter vehicle was/is used by Australia, Canada, and Israel that I know of for sure. Other countries may use it too.
Australian
Canadian
Israeli
Apparently Denmark uses them too.
and a UN vehicle.
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