I love the cute smile the adorable Marine on the left flashes his buddy at the 1:09 mark.
And the title of this post is what a unit performing close order drill tries to achieve with all its movements.
Someone watching COD being performed can judge some of the quality of the drill movements simply by closing his eyes and listening.
If the movement makes a single popping sound from everyone performing it — it’s been executed properly. While if you hear a ripple in the sound of the movement, then it hasn’t been as tightly executed as it should have.