With the end of the Cold War, operations at the base were scaled back with many of the men and equipment moving to other bases, including returning to the U.S. In 1990, the last combat aircraft, a squadron of F-4 fighter-bombers, were transferred to Alaska. On 10 June 1991, two days before Mount Pinatubo began the summer-long series of eruptions, Clark Air Base was completely evacuated of all but mission essential personnel.