The 6922d Security Group was activated in April 1970 at Clark Air Base in the Philippines. Initially, the group conducted operations through subordinate detachments ranging from Thailand through Japan. With the withdrawal of the United States from Vietnam, operations were substantially reduced, and by 1974 were limited to direction finding, and the group was reduced to the 6922d Security Squadron. Operations continued through June 1991, when Mount Pinatubo erupted, covering Clark with volcanic ash. It became apparent that resumption of operations at Clark was neither financially or politically viable, and the squadron began to devote itself to the salvage and removal of equipment, except for a small contingent of linguists. The squadron was inactivated as remaining Air Force assets at Clark were turned over to the Philippine government.