Medal of Honor Allied Assault
First ever released gameplay footage of the pc game of the year (2002) Medal of Honor Allied Assault. The camera system in this version was very different as you can see by the movement of the weapons (was possible to look down and see your legs and feet). This camera system was later removed and a standarised system was put in place due to clipping issues.
The game also initially had a prone (laying down) system for the player and iron sights, these however got removed due to the fact that animating the prone position for the weapons and iron sights for all the weapons would delay the games release.