Correct me if im worng, but i want to see that the ia leader dont use the machine gunners to engage enemy. They have a support role and must stay near the team or group leader. The machine gunner must support by fire to other soldiers that are engaging the enemy. It have no sense to send the MG to attack an enemy, so when the ia commands de MG to attack just shoot from prone position and dont stand up and go and hunt the target. If it is out of range, just ignore the order.
Thx.