Just seems a bit weird to me that a guy stepping off a Chinook only has 90 degrees frontal arc view. Sure, stopping to look left and right is cool and realistic, but it just seems weird.
http://en.wikipedia.org/wiki/Human_eye#Field_of_view
- bad picture but you get the point. Granted, with adrenaline and guns and explosions I always get tunnel vision, and most of my fellow soldiers/cops, too.