Unit 543
| Weapons of mass destruction |
|---|
| By type |
| By country |
|
| Non-state |
| Biological weapons by country |
| Chemical weapons by country |
| Nuclear weapons by country |
| Proliferation |
| Treaties |
|
Unit 543 was a secret Imperial Japanese Army facility at Hailar that focused on the development of biological weapons during World War II. It was operated by the Kempeitai, the Japanese military police.