GUANTANAMO BAY, Cuba — As the United States prepares to mourn the 20th anniversary of the terrorist attacks of Sept. 11, 2001, another anniversary is being marked at Guantanamo Bay — the 15th anniversary of President George W. Bush announcing 9/11 mastermind Khalid Sheikh Mohammed and other al Qaeda members had been transferred to the U.S. naval base.

Fifteen years later, a trial still hasn’t happened.