A 1901 letter from Vice President Theodore Roosevelt to Frank Frantz regarding sending a letter and mentioning their reunion was pleasant. Roosevelt refers to Frantz as "Captain." Frantz served as a captain in Teddy Roosevelt's Rough Riders during the Spanish-American War. Approximately a year after this letter was written, Roosevelt became the U.S. President when President McKinley was assassinated. On his visits to the White House, Frantz, an athlete and a boxer, engaged in several matches with the president, knocking him out on three occasions.