The members of Delta Squad start to bleed, bruise, and look war-torn as the campaign progresses. Soon, the clean, proper, and heroic soldiers from the start of the game become almost unrecognizable. Along with this progression, Walker especially shows signs of mentally unravelling as he experiences the horrors of war time and time again. Instead of staying reserved about his decision to kill other American soldiers, near the end of the game he becomes much more violent, and announces his confirmed kills