In the movie Aliens, it takes Ripley and Burke to point out that firing armor-piercing rounds inside a cooling tower is a no-go, since if one of the bullets damaged a tower, the result would be a nuclear explosion.
My question is why weren't the marines briefed on this before they entered the cooling towers, or even before they landed on LV426?
It seems a little odd that nobody mentioned to them before they went in that firing armor-piercing rounds inside the cooling towers would be a no-go, meaning that they'd need to leave their ammo behind before entering any of them.