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Roosevelts' Cavalry Regiment was nicknamed the "Rough Riders". Officially, it was the First US Volunteer Cavalry Regiment (Army).
"Rough Riders" was the nickname of the 1st United States Volunteer Cavalry Regiment.
Theodore Roosevelt organized and equipped the "Rough Riders" (1st Volunteer Cavalry Regiment).
1st US Volunteer Cavalry Regiment, AKA the "Rough Riders"
Unofficially, the "Rough Riders". Officially, 1st Volunteer Cavalry Regiment (Army).