400th Chemical Laboratory

The 400th Chemical Laboratory was constituted during World War II as part of the U.S. Army’s Chemical Corps, tasked with supporting chemical warfare defense and analysis. Activated in 1943, the unit provided critical laboratory testing of chemical agents, protective materials, and decontamination procedures both in training environments and combat zones. Stationed primarily in the European Theater, the 400th played a key role in ensuring the safety and effectiveness of Allied chemical operations. After the war, the unit was inactivated as part of the postwar drawdown and restructuring of Army chemical units.