Why did US calvary wear yellow bandanna?

The U.S. Cavalry wore yellow bandanas as part of their uniform primarily for practical reasons. The bright color served as a way to identify cavalry troops quickly in the field, promoting unit cohesion and recognition. Additionally, the yellow bandanna could be used for various purposes, such as protection against dust and sun, or even as a makeshift first aid or signaling device. The distinctive color became a recognizable symbol of the cavalry units during the late 19th century.