An Air Force general says he has lost confidence in a commander at Scott Air Force Base and relieved him of his command.

In a news release, Lieutenant General Giovanni Tuck says he relieved Colonel John Howard of command of the 375th Air Mobility Wing on Monday and that Colonel W. Chris Buschur had taken over.

The release does not explain why he had “lost confidence in Howard’s leadership and ability to continue serving in command.”

Howard was scheduled to speak at SIU Edwardsville’s fall commencement on Saturday, but a university spokesman says the school was notified that the base would send another colonel.