I know this from experience. Perfect formation marching must be drilled constantly. The US military does not waste its time with it because it is useless beyond Basic Training.

As do I. There is no active duty enlisted person not capable of marching down a street in step in a reasonably square block. (And I would assume this also true for officers but I wouldn’t know that.)

We’re not talking about doing a halftime show in a marching band. It takes an hour of instruction and practice to do it reasonably well.

Sorry if it seems like I’m jumping on you, but I’m stunned at the number of folks scratching their heads like they aren’t sure if the soldiers were intentionally out of step or not, and you are just the first one I’ve replied to. They were intentionally out of step.