i cant seem to figure out how to get past the one part where you have to shoot the helicopter of of the sky and jump from the one lift to other and kill the one guy by pressing the buttons when it tell you to.. I can complete the level however after all the credits play it makes me repeat the same level over and over again... It is right around 51.7% mark.. Can someone pleaes help me with this??/
Once you've finished the game, it will keep going to the last mission unless you either start over or pick another mission to replay. As for the %, you have to find all the intel (laptops) which are hidden throughout the campaign. If you can't find them, there are guides/walk throughs on youtube.