FILE - In this In this July 1, 2011 file photo, a Clark Veterans Cemetery marker faces more than 8,000 tombstones at the sprawling Clark Economic Zone, a former U.S. Air Force base in Dau, Pampanga province in northern Philippines. U.S. and Philippine officials signed an agreement Monday, Dec. 16, 2013, allowing Washington to restore the cemetery where the graves of thousands of American servicemen and dependents have been covered in ash since Mount Pinatubo's 1991 eruption. (AP Photo/Bullit Marquez, File)