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Newly discovered documents reveal that 50 years ago this week, the Pentagon dispatched a chemical weapons platoon to Okinawa under the auspices of its infamous Project 112. Described by the U.S. Department of Defense as “biological and chemical warfare vulnerability tests,” the highly classified program subjected thousands of unwitting American service members around the globe to substances including sarin and VX nerve gases between 1962 and 1974.

According to papers obtained from the U.S. Army Heritage and Education Center in Carlisle, Pennsylvania, the 267th Chemical Platoon was activated on Okinawa on Dec. 1, 1962, with “the mission of operation of Site 2, DOD (Department of Defense) Project 112.” Before coming to Okinawa, the 36-member platoon had received training at Denver’s Rocky Mountain Arsenal, one of the key U.S. chemical and biological weapons (CBW) facilities. Upon its arrival on the island, the platoon was billeted just north of Okinawa City at Chibana — the site of a poison gas leak seven years later. Between December 1962 and August 1965, the 267th platoon received three classified shipments — codenamed YBA, YBB and YBF — believed to include sarin and mustard gas.

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