killing him self at his sisters grave but the U.S. is still intact. if you didn't kill Menendez and cloe lived then she finds the celarium worm and deactivates it. ruining Menedezes plan of escape and never getting revenge. if you shot Alex anywhere but the head when being tricked by Menendez and you got either ending where Menendez is captured then you find out Alex faked his death when he goes-