Marching lockstep is something that takes years to stop doing after getting out, though. Band kids have a similar problem. And even then you catch it sometimes, a desire to do it..

It bothers you for years when you walk hand in hand with your partner. Because you can’t hold hands and walk lockstep.. you have to perfectly time the opposite step, so you can perfectly hold their hand.

It only takes one refresher, and you go back to it.

D&C is used daily by the US Army, to move personnel from point A to point B. During running. During inspections. During pass and reviews.

15 years out, and "9 to the front and 6 to the rear" is still drilled into my head. Even my "about face" is still solid, while needing some practice.