A U.S. Air Force C-123 sprays herbicides on dense jungle beside a South Vietnamese highway on May 18, 1966. This aircraft is the last in a formation of three. Spray from the other two planes can be seen ahead. U.S. Air Force via AP hide caption

itoggle caption U.S. Air Force via AP

If a plan taking shape is finalized, the MV Cape Ray, managed by the U.S. Department of Transportation, will be turned into a floating chemical weapons disposal plant. U.S. Department of Transportation Maritime Administration hide caption

itoggle caption U.S. Department of Transportation Maritime Administration