I don't know the show, but I believe it's set in the US, and the last American tank I know of with a belly hatch was the M60 that left frontline service a few y

I don't know the show, but I believe it's set in the US, and the last American tank I know of with a belly hatch was the M60 that left frontline service a few years after I was born. Abrams don't have them, and after recent decades' experiences with IEDs and development of hull designs to reduce or defeat their effects, I suspect it'll likely be a while before they turn up again.