Colonel Theodore Roosevelt of the Rough Riders, a regiment of volunteers in the United States Army. Under Roosevelt's leadership, the Rough Riders became famous for dual charges up Kettle Hill and San Juan Hill on July 1, 1898. On leaving the Army, Roosevelt was elected governor of New York in 1898. He was then chosen to be William McKinley's vice-presidential running mate in the 1900 election. Roosevelt then succeeded to the presidency upon McKinley's assassination in 1901.Photo credit: B. J. Falk