LACKLAND AIR FORCE BASE, Texas (AP) — The head of the Air Force’s training command ordered an independent investigation into instructor misconduct Friday amid a scandal at a Texas base that already has led to sexual misconduct charges against four instructors.

Gen. Edward A. Rice Jr., commander of the Air Education and Training Command, said in a statement that he has appointed Maj. Gen. Margaret H. Woodward — acting director of operational planning, policy and strategy at the Air Force’s headquarters in Washington — to lead the investigation that will include all training units in the command.