A ceremony was held at Hill Air Force Base Thursday afternoon to mark the progress of the deactivation of the Peacekeeper missile.A ceremony was held at Hill Air Force Base Thursday afternoon to mark the progress of the deactivation of the Peacekeeper missile.A ceremony was held at Hill Air Force Base Thursday afternoon to mark the progress of the deactivation of the Peacekeeper missile.A ceremony was held at Hill Air Force Base Thursday afternoon to mark the progress of the deactivation of the Peacekeeper missile.