Back in my day, OPFOR was just called "The Aggressor Team", and we got to play in the field against the home team every day.
One dark and cloudy night, I lit off a star flare to signal a delayed 2 point attack, and the flare bounced off a tree limb, lit a battalion CP Large on fire, and it ate the switchboard, supply, C-rat stack, a Lt. Col's beer stash, and he and the CSM's TA-50, cots, clothes, and card game.
For once, it was not a good day to be me.