Unit 543

{{Short description|Secret facility of Imperial Japanese army}}{{More references|date=March 2023}}{{Weapons of mass destruction}}

Unit 543 was a secret Imperial Japanese Army facility at Hailar that focused on the development of biological weapons during World War II.{{Cite web |title=Imperial Japan's Chemical Warfare Development Program |url=https://www.pacificatrocities.org/imperial-japan-warfare-development.html |access-date=2024-09-11 |website=Pacific Atrocities Education |language=en}} It was operated by the Kempeitai, the Japanese military police. Hal Gold, Unit 731 Testimony, 2003