What was Roosevelt regiment called and why?

The Roosevelt regiment was called the "Rough Riders," officially known as the 1st United States Volunteer Cavalry. This regiment was formed during the Spanish-American War in 1898 and was composed of a diverse group of volunteers, including cowboys, miners, and college athletes. Theodore Roosevelt, who would later become President, was a prominent leader and a key figure in its formation, which contributed to its rugged image and name. The Rough Riders are particularly famous for their charge up San Juan Hill during the Battle of San Juan Heights.