On the campaign mission 5 (Radio Silence). After starting the mission and saving right before the hostile counter attack on the base, I closed the game and left the campaign for a bit. Later on I reloaded that save and continued playing. As the AI moved into the base, I started to lob some shots and grenades at them.I noticed that the friendly AI that had spread themselves around the base we not helping me at all. They never fired a shot. I died and reloaded the save. I hid in a building until they started firing on the friendly AI. I shot some of them and they never payed me any mind. I went out of the back of the building and found an enemy AI firing several clips into a prone friendly. He hit him 30-40 times before I dropped the hostile. I reloaded several times and the same thing occured.