Found this:
What is the process for renaming bases?
"
The decision to name (or rename) installations falls to the assistant secretary of the Army for manpower and reserve affairs — an office currently held by retired Army officer Casey Wardynski. In the mid-2000s, Wardynski developed a video game called “America’s Army” while serving on the faculty at West Point. Army guidance directs that installation names be relevant to their surrounding areas.
The Army had no comment on the president’s declaration when reached by phone Wednesday afternoon. There is no requirement for politicians or the White House to approve Army base name changes, though it’s unclear if the service will still consider the move following the president’s tweets."
Surprises me that one person has that kind of authority.
The Army Was Open to Replacing Confederate Base Names. Then Trump Said No.