The United States created rules for encountering a Yeti during the Cold War
During the Cold War, the US State Department established guidelines for Americans who might encounter a Yeti in the Himalayas. The rules included a directive not to harm the creature unless in self-defense. This was intended for American adventurers and explorers who were searching for the mythical ape-like creature, also known as the Abominable Snowman.
The Yeti is a legendary creature with no conclusive evidence to prove its existence. Despite this, the US Embassy in Nepal deemed it necessary to create rules for potential encounters. Further details on these guidelines are available from the US State Department's historical records.