The 9th Cavalry Regiment is a military unit of the United States Army, originally established as a Buffalo Soldier regiment during the Reconstruction era after the American Civil War. Although it was initially a cavalry unit, the 9th Cavalry transitioned into an armored cavalry regiment in the mid-20th century. The regiment has seen active service in various conflicts including the SpanishAmerican War, World Wars, the Korean War, and Operation Iraqi Freedom. Notably known for its diverse composition and historic contributions, the 9th Cavalry Regiment continues to uphold its motto, "To Protect and Serve," in the modern U.S. Army.