The commander of the U.S. prison at Guantánamo Bay Naval Base in Cuba has been fired.

Rear Adm. John Ring, commander of Joint Task Force-Guantánamo, was relieved of duty Saturday following an investigation, according to the New York Times. Adm. Craig Faller made the call due to a “loss of confidence in his ability” to continue running the prison, which houses some of the most infamous terrorists in the world.