Back when being deployed was fun, 3d ACR's ROE was if it shoots it get a 120mm. Good policy if you were on a tank, not so good if you weren't.
a lot of people including the higher ups act like a HEAT or MPAT will implode an entire city block.
If the crews are chambering rounds then they are prepared to use them, regardless of cost, as most of the casings are cheap and break often.