Horn Island Chemical Warfare Service Quarantine Station, Chemical warfare testing facility on Horn Island, Mississippi, United States.
The Horn Island Chemical Warfare Service Quarantine Station was a testing facility occupying 2,000 acres with multiple buildings and roads spread across the site. A narrow-gauge railway spanning 7.6 miles moved materials throughout the grounds.
The facility opened in 1943 and ran from October 1943 to July 1944, conducting around 23 test series with toxic substances. The project shut down as civilian maritime traffic nearby posed safety concerns.
The island once housed a specialized research community, with scientists and their families living in nearby towns during the war years. This temporary presence left marks on local memory and the region's identity.
The site today is difficult to access because it is on an island and protected as a nature reserve and historical site. Visitors should contact local authorities or conservation organizations to learn about visiting possibilities.
A secret 1946 operation called Hornblow removed and incinerated 133 mustard gas bombs from the island. Later soil tests confirmed no chemical traces remained.
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