CAT, Cat Anti Tank. Disables armored fighting vehicles by missiling up to the vehicle, climbing on top and driving through the hatches to scratchs the hell out of the on board crew. Dont ask how the CAT, gets through closed hatches, practical experience just shows they do.

When asked about the hatches matter, the CAT complained about:

questioners lack of understanding importance of operational security around classified war technology.
where is their food, they don't disable couple enemy tanks per day for free.

Benefit of CAT over other AT weaponry is they leave the vehicle in good technical condition to be captured. Minus gory remains of the previous crew inside.