AKA - it’s the department of defense in the same way Robert Kennedy was named Robert but went by Bobby sometimes. Trump doesn’t get to change the name, just assign an unofficial nickname that he thinks sounds more tough. Sort of like his pretend tough guy Secretary of defense that dresses up as a Secretary of war for TV moments. The fact they drag along the entire military and its leadership in their charade is embarrassing, and the asinine nickname is expensive and likely causes operational confusion.