I used to show an episode of American Rifleman TV in my training classes just to illustrate improper technique.
Some of the range shooting with the camera pointed back towards the shooter, you can see obvious flinches, they blink their eyes, dip the muzzle.
Yeah, this is sad.
The guy screws up the difference between the Marine 36 yard vs. the Army 25 meter zero procedure and states the setting incorrectly. To obtain a 300 meter zero at 25 meters with the M16A4, set the elevation drum to two clicks (1 MOA) above the 300 meter setting. The drum should read 6/3+2, NOT -2. The short barrel M4 should be left at 300 meters (6/3)
The AMU Service Rifle team has a MUCH better video: