Putting the D in METT-TC.

I describe the D as decentralization. Specifically,

Train your subordinates, give them specific guidance and clear mission, hold them to a standard, and then let them do their thing with your support. If they cross the line, then replace them, but DO NOT ever hamper them from completing the mission that you asked them to do. This involves trust both up and down, left and right along the line. Unfortunately, trust and truth are all so elusive in the natural state of man.
Or as David Kilcullen suggests,

Train the squad leaders — then trust them’
Why do we hand wave this, and then wish that we could be squad leaders as we progress through the ranks?

Within the last decade in my direct experience, decentralization is not done.

Where did we fail?