About this Unit
USACAP Johnston Atoll, officially known as the United States Army Chemical Activity Pacific, was established in the 1970s on Johnston Atoll in the Pacific Ocean. The unit was primarily responsible for the safe storage, management, and eventual destruction of the U.S. chemical weapons stockpile located on the atoll. USACAP Johnston Atoll operated the Johnston Atoll Chemical Agent Disposal System (JACADS), the first full-scale chemical weapons destruction facility in the world, which began operations in 1990. The unit completed its mission with the destruction of the last chemical munitions in 2000, and the facility was closed and dismantled by 2003, marking the end of the Army’s permanent presence on Johnston Atoll.
Historical Facts
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Strategic Location: Johnston Atoll is a remote island located about 750 miles southwest of Hawaii in the North Pacific Ocean, making it a vital strategic outpost for the US military since World War II.
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Early Military Use: The U.S. Navy began using Johnston Atoll as an airbase and seaplane refueling station in the late 1930s, and it played a role in World War II as a refueling and staging area.
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USACAP Overview: "USACAP" stands for United States Army Chemical Activity Pacific, which managed the storage and destruction of chemical weapons at Johnston Atoll from the 1970s until the early 2000s.
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Agent Orange Storage: In the 1970s, Agent Orange, a toxic herbicide used in the Vietnam War, was stored at Johnston Atoll before being incinerated at sea during Operation Pacer IVY.
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Johnston Atoll Chemical Agent Disposal System (JACADS): JACADS was the first full-scale chemical weapons destruction facility in the world, operating from 1990 to 2000 and destroying thousands of tons of nerve and blister agents.
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Nuclear Testing: The atoll was used for several high-altitude nuclear tests during the 1950s and 1960s, most notably as part of Operation Hardtack and Operation Dominic.
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Missile Defense Testing: Johnston Atoll served as a launch site for anti-ballistic missile testing and satellite tracking during the Cold War.
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Environmental Cleanup: After the closure of military activities, extensive cleanup and decontamination efforts were conducted to address chemical, radioactive, and hazardous waste left on the island.
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Endangered Wildlife Sanctuary: The atoll is now a National Wildlife Refuge, hosting endangered seabirds, turtles, and coral ecosystems, protected by the U.S. Fish and Wildlife Service.
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Closure and Demolition: USACAP and all military personnel departed by 2004; almost all structures were demolished, and access is now strictly controlled to preserve the site's environmental recovery.
