Located atop Phou Pha Thi in northeastern Laos, Lima Site 85 was a top-secret CIA-run radar base that was highly valuable to U.S. bombing efforts in the Vietnam War. The site was disguised as a civilian installation owned by Lockheed Martin and Air America. It was manned mostly by U.S. Air Force soldiers who were disguised as employees, and only civilian aircraft could travel to and from the base. By late 1967 the site's radar was responsible for directing 55% of U.S. bombing operations against North Vietnam.