You are supposed to blow it up! That is the main point and why its called High Value TARGET!
My experience of the darn thing is that it is always located in your LZ (or central grid). So if you’re unlucky (as I once was) you encounter it during drop off. My tip is to move straight away in the direction your helos came from – usually south-east. Run off to the bushes a bit from LZ, wait for covert mode, the move slowly in the LZ and try to spot the hellish machine.