Original U.S. Vietnam War Era Operation Igloo White Seismic Sensor ADSID I with Fins OPTIONS_HIDDEN_PRODUCT Brass visor is painted grass

Brass visor is painted grass green on the underside

Laid down 13 August 1941 by the Electric Boat Co

so we measured the exterior

above serial number 81650

with gilt bullion wire piping and caduceus

Original U.S. Vietnam War Era Operation Igloo White Seismic Sensor ADSID I with Fins OPTIONS_HIDDEN_PRODUCT Brass visor is painted grassOriginal Item: Only One Available. Using the cover of darkness, dense jungle and bad weather, North Vietnamese trucks carried critical supplies down the Ho Chi Minh Trail nearly undetected. Since large numbers of American ground troops were not permitted into neutral Laos to stop the trucks, the U. S. Air Force deployed a system of electronic seismic sensor equipment to thwart the enemy's cover and alert U. S. commanders. This highly classified