Defense Secretary James Mattis on Thursday met with troops at the U.S. naval base at Guantanamo Bay, Cuba, according to The Associated Press. 

Mattis became the first Defense chief since 2002 to take a trip to Guantanamo. He did not tour the detention facility there or discuss the Trump administration’s policies regarding its detainees, the AP reported. 

The prison at Guantanamo has been used to hold suspected terrorists, and 41 detainees are currently held at the facility. Ten of those detainees have been charged by a military commission, according to the AP, and five have been cleared to leave. 

The Trump administration has not released any detainees from the prison or cleared any others to leave.