I'll keep going with the MW2 trend and say the beginning and end of "Of Their Own Accord". The one that starts in a dark, quiet bunker where you walk past all the injured soldiers and meet up with your squad, then head up the stairs to see all the burning D.C. landmark with artillery and planes flying around everywhere, accompanied by Hans Zimmer's epic soundtrack. And then ends with you in a helicopter dodging dozens of RPGs and knowing you'll never make it out, spraying your minigun trying to take out anything you can before you go down. Also accompanied by Hans Zimmer's epic soundtrack.