The skull and crossbones symbol has been used by military units for centuries to signify danger and death. In the case of the Rough Riders flag, the skull and crossbones also represented the regiment's motto: "We Ride or We Die." The color red was chosen for the flag because it is the color of blood and warfare.
The Rough Riders flag is a symbol of courage, determination, and sacrifice. It represents the brave men who fought in the Spanish-American War and helped to make America a great nation. The flag is also a reminder of the importance of freedom and democracy, and the sacrifices that have been made to protect these ideals.