This is a Halo 3 dualtage from Kenshi and Hes Pro, edited by SillyGoose. I wasn't that impressed with a couple of the clips, but the gameplay's (before people complain 100 MLG refers to the actual body of the montage, not the credits) good overall, displaying a couple known names here and there, and the editing is incredibly well done, showcasing a lot of well-applied effects and angles.