胡志明小道
Operation Hardnose was a Central Intelligence Agency-run espionage operation spying upon the Ho Chi Minh trail that began during the Laotian Civil War. Started in Summer 1963, it soon attracted the attention of the U.S. Secretary of Defense, Robert McNamara. By December 1963, he was calling for its expansion. Operation Hardnose expanded and continued to report on the Ho Chi Minh trail even as American military intelligence activities mounted against the communist supply artery. In an attempt to adapt technology for use by illiterate Lao Theung, some of the U.S. Air Force's survival radios were modified by the CIA for use by their spies.