The British armed forces use a similar system subdivided into:
Service Support - Sustainment
Command and signal
What is meant by preliminaries and sustainment?
What you need to do before hand and what you need to do to reinforce the situation basically.
CQB-TEAM Education and Motivation.
"Pragmatism over theory."
"Anyone with a weapon is just as deadly as the next person."
"Unopposed CQB is always a success, if you wanted you could moonwalk into the room holding a Pepsi."