Question: What type of unit was this unit of the United States Army that served in combat during the Indian Wars in the western United States for which Wade H. Hammond served as bandmaster?

Context articles: Henry C. Merriam
Wade H. Hammond
Pompey Factor
Charles H. Bennett (soldier)
10th Cavalry Regiment (United States)
Isaac Payne
John Ward (Medal of Honor)
Adam Paine
James Sumner (Medal of Honor)
XV Corps (United States)

Henry Clay Merriam (November 13, 1837 – November 12, 1912) was a United States Army general.
 He received the United States military's highest decoration, the Medal of Honor, for his actions as a Union officer in command of African American troops during the American Civil War.
 He later served in various Indian Wars throughout the western United States and commanded the 7th Infantry Regiment.
 After being promoted to brigadier general, he took on a training and supply role during the Philippine–American War.
Wade H. Hammond (1879–1957) was an American musician who became one of the first African American bandmasters in the United States military in 1909, for the 9th Cavalry.
 He later also served as bandmaster for the 10th Cavalry and 25th Infantry.
 Hammond received his B.A. from Alabama A&M College, and then studied at the Royal Military School of Music of England.
 He also taught at both Alabama A&M and Western University.
Pompey Factor (1849 – March 29, 1928) was a Black Seminole who served as a United States Army Indian Scout and received America's highest military decoration—the Medal of Honor—for his actions in the Indian Wars of the Western United States.
Charles H. Bennett (18 August 1811 – 7 December 1855) was present at the discovery of gold that initiated the California gold rush in January 1848.
 Earlier he served in the United States Army and was captain of a militia unit of the Provisional Government of Oregon.
 In later years he operated a hotel in the Oregon Territory before dying in the Indian Wars as a captain of a cavalry unit.
The 10th Cavalry Regiment is a unit of the United States Army.
 Formed as a segregated African-American unit, the 10th Cavalry was one of the original "Buffalo Soldier" regiments in the post-Civil War Regular Army.
 It served in combat during the Indian Wars in the western United States, the Spanish–American War in Cuba and in the Philippine–American War.
 The regiment was trained as a combat unit but later relegated to non-combat duty and served in that capacity in World War II until its deactivation in 1944.
Isaac Payne, or Isaac Paine, (1854–1904) was a Black Seminole who served as a United States Army Indian Scout and received America's highest military decoration—the Medal of Honor—for his actions in the Indian Wars of the western United States.
John Ward (1847 or 1848 – March 24, 1911) was a Black Seminole who served as a United States Army Indian Scout and received America's highest military decoration—the Medal of Honor—for his actions in the Indian Wars of the western United States.
Adam Paine, or Adam Payne, (1843 – January 1, 1877) was a Black Seminole who served as a United States Army Indian Scout and received America's highest military decoration—the Medal of Honor—for his actions in the Indian Wars of the western United States.
James Sumner (1840 – July 5, 1912) was a United States Army soldier and a recipient of the United States military's highest decoration, the Medal of Honor, for his actions in the Indian Wars of the western United States.
 An English immigrant, Sumner served as a cavalryman during the Apache Wars of southeastern Arizona Territory.
 He was awarded the Medal of Honor for advancing through heavy fire in a skirmish against a group of Chiricahua Indians led by Cochise.
The XV Corps of the US Army was initially constituted on 1 October 1933 as part of the Organized Reserves, and was activated on 15 February 1943 at Camp Beauregard, Louisiana.
 During the Second World War, XV Corps fought for 307 days in the European Theater of Operations, fighting from Normandy through France and southern Germany into Austria.
 The corps was commanded in combat by Major General Wade H. Haislip, initially as a subordinate unit to the Third U.S. Army and later as part of the Seventh U.S. Army.