Four Afghans from the Guantanamo Bay detention camp were sent back to their home country, the Department of Defense announced Saturday, The Associated Press reported. The transfer is a sign of U.S. government's confidence in new Afghan President Ashraf Ghani, U.S. officials said. The Defense Department identified the detainees as Mohammed Zahir, Shawali Khan, Abdul Ghani and Khi Ali Gul. Eight Afghans are among the 132 detainees remaining at Guantanamo. The move is the latest in a series of transfers as President Barack Obama tries to reduce the number of those held at Guantanamo and works toward his goal of closing the detention center.