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A U.S. made Humvee vehicle is the only visible activity inside Clark Air Base, Philippines, June 11,1991, a day after 16,000 Americans were evacuated to another military base following the mild eruption of Mount Pinatubo last Sunday, June 9. All operations came to a halt in this once-busy military base, 50 miles north of Manila, as the volcano ( in background ) continues to emit ash and threatens to erupt. ( AP Photo/ Bullit Marquez ) (KEYSTONE/AP/Bullit Marquez)