Question: Who were originally members of the 10th Cavalry Regiment of the United States Army, and included William H. Thompkins, a recipient of the Medal of Honor, for his actions in the Spanish-American War?

Context paragraphs:
348th Cavalry Regiment (United States): The 348th Cavalry Regiment was a United States Army cavalry regiment, represented in the Georgia Army National Guard by Troop E, 348th Cavalry, headquartered at Griffin, Georgia, part of the 48th Infantry Brigade.  It was constituted in 1973 after Troop E was reflagged from a unit of the 196th Cavalry.  In 1995, Troop E was reflagged as Troop E, 108th Cavalry.

2nd Squadron, 16th Cavalry Regiment: The 2nd Squadron, 16th Cavalry Regiment (2-16 CAV) is the United States Army Armor School's proponent for Armor Basic Officer Leaders Course (ABOLC).  The squadron's four troops are Hawk Troop, Ironhorse Troop, Killer Troop, and Darkhorse Troop.  The Headquarters and Headquarters Troop (HHT) is responsible for training lieutenants awaiting their ABOLC class or who have completed the course and are awaiting for follow-on orders or to attend functional schools.  HHT is also responsible for the certification of all instructors at the Armor Basic Officer Leadership Course.  Each instructor is initially certified in the U.S. Army Basic Instructor Course, and then must undergo specific instruction to learn the doctrine that is taught to the Armor and Cavalry lieutenants.  ABOLC is the introductory skills course for United States Army Cavalry and Armor second and first lieutenants.  These officers, recent graduates of the United States Military Academy, ROTC programs, and Officer Candidate School, receive eighteen weeks of training in basic soldiering skills, maneuver tactics, troop- and company-level strategy, and logistical planning.  ABOLC consists of three phases - the first focusing on individual soldier skills; Phase II focusing on platform and crew training; and Phase III focusing on tactics and field training.  The final exercise, the Competitive Maneuver Exercise (CME), is a strenuous seven-day problem-solving exercise which evaluates a students ability to demonstrate proficiency in cumulative course outcomes.  Students are evaluated based on their performance during each exercises, and rotate among every position within a platoon and troop.  The course is taught by officers, non-commissioned officers, and civilians from the 2nd Squadron, 16th Cavalry Regiment of the 199th Infantry Brigade.  The 2nd Squadron, 16th Cavalry currently operates out of Harmony Church in Fort Benning, Georgia.  The squadron was reassigned from the 316th Cavalry Brigade in the fall of 2013 as part of restructuring within the Maneuver Center of Excellence.

Samuel Whitside: Brigadier General Samuel M. Whitside was a United States Cavalry officer who served from 1858 to 1902.  He commanded at every level from company to department for 32 of his 43 years in service, including Army posts such a Camp Huachuca, Jefferson Barracks, and Fort Sam Houston, the Departments of Eastern Cuba and Santiago and Puerto Principe, Cuba, commanded a provisional cavalry brigade (consisting of the 10th and 5th Cavalry Regiments), a squadron in the 7th Cavalry Regiment, and a troop and platoon in the 6th Cavalry Regiment.  The pinnacle of his career was serving as the Commanding General of the Department of Eastern Cuba before retiring in June 1902 as a Brigadier General in the U.S. Army.

299th Cavalry Regiment (United States): The 299th Cavalry Regiment, formerly the 299th Infantry Regiment, nicknamed the "The Koa Regiment", is a unit of the Hawaii Army National Guard.  It was established in 1923 from the old 2nd Hawaiian Infantry Regiment, and it served during World War II as part of the 24th Infantry Division.  The name "Koa" comes from the Hawaiian word for "Warrior", and is currently headquartered in Hilo, Hawaii.  The 1st and 2nd Battalions, 299th Infantry were federally activated in 1968 to support the United States Army Pacific during the Vietnam War.  More recently 2nd Battalion, 299th Infantry Regiment deployed to Iraq and again after being re-flagged in 2007 as 1st Squadron, 299th Cavalry Regiment.

Buffalo Soldier: Buffalo Soldiers originally were members of the 10th Cavalry Regiment of the United States Army, formed on September 21, 1866, at Fort Leavenworth, Kansas.  This nickname was given to the "Negro Cavalry" by the Native American tribes they fought in the Indian Wars.  The term eventually became synonymous with all of the African American regiments formed in 1866:

3rd/4th Cavalry Regiment (Australia): The 3rd/4th Cavalry Regiment is an armoured regiment of the Australian Army, and is third in order of precedence in the Royal Australian Armoured Corps.  The regiment was formed in 1981 through the amalgamation of the 3rd Cavalry Regiment and the 4th Cavalry Regiment.  Currently there is only one squadron in existence, 'B' Squadron, which is currently part of the 3rd Brigade and is based in Townsville, Queensland.  Recent deployments have included Iraq, Afghanistan and Timor Leste.  The unit operates the Bushmaster Protected Mobility Vehicle (PMV).  In December 2014, the squadron's personnel will be transferred to the 2nd Cavalry Regiment as part of that unit's establishment as an Armoured Cavalry Regiment, while the squadron will be transferred to Australian Army Reserve and reassigned to the 11th Brigade.

17th Cavalry Regiment: The 17th Cavalry Regiment is a historical organization within the United States Army that began as a regiment of cavalry after the Pancho Villa Expedition.  The unit was constituted on 1 July 1916 in the Regular Army as the 17th Cavalry at Fort Bliss, Texas and originally inactivated 26 September 1921 at the Presidio of Monterey, California.  Formerly a part of the 1950s Combat Arms Regimental System, it was reorganized as a part of the U.S. Army Regimental System, an ongoing effort to maintain the lineage and history of the U.S.Army through its units.  Today, the 17th Cavalry Regiment is found across the army within the combat aviation brigades, where the squadrons, now constituted as attack/recon helicopter squadrons, carry on the legacy of the 17th Cavalry Regiment.

4th Regiment South Carolina Cavalry: The 4th South Carolina Cavalry Regiment was a regiment of cavalry in the Confederate States Army during the American Civil War.  They were from the state of South Carolina and served primarily in the Eastern Theater of the American Civil War.  The 4th South Carolina Cavalry Regiment was organized on December 16, 1862, by consolidating the 10th Battalion South Carolina Cavalry, the 12th Battalion South Carolina Cavalry, the Charleston Light Dragoons and Company A of the St. James Mounted Riflemen.  The 10th Cavalry Battalion (also called the 3rd Battalion) was organized in the spring of 1862 with five companies, and Major James P. Adams and Major William Stokes were the commanding officers.  The 12th Cavalry Battalion had also been known as the 4th Cavalry Battalion.

4th Cavalry Regiment (United States): The 4th Cavalry Regiment is a United States Army cavalry regiment, whose lineage is traced back to the mid-19th century.  It was one of the most effective units of the Army against American Indians on the Texas frontier.  Today, the regiment exists as separate squadrons within the U.S. Army.  The 1st Squadron of the 4th Cavalry's official nickname is "Quarterhorse", which alludes to its 1/4 Cav designation.  The 3rd Squadron of the 4th Cavalry's official nickname is "Raiders".  Today, the "1st Squadron, 4th Cavalry", "2nd Squadron, 4th Cavalry", "4th Squadron, 4th Cavalry", and "6th Squadron, 4th Cavalry" are parts of the 1st Infantry Division, while the "3rd Squadron, 4th Cavalry" serves as part of the 25th Infantry Division.  On 23 September 2009, the "4th Squadron, 4th Cavalry" officially stood up at Fort Riley, Kansas as part of the 1st "Devil" Brigade, 1st Infantry Division.  On 28 March 2008, the "5th Squadron, 4th Cavalry" officially stood up at Fort Riley, Kansas as part of the 2nd "Dagger" Brigade, 1st Infantry Division.  The 6th Squadron, 4th Cavalry served as part of the recently inactivated 1st Infantry Division, 3rd "Duke" Brigade, at Fort Knox, Kentucky.

William H. Thompkins: William H. Thompkins (October 3, 1872 – September 24, 1916) was a Buffalo Soldier in the United States Army and a recipient of America's highest military decoration—the Medal of Honor—for his actions in the Spanish–American War.

Supporting paragraphs: William H. Thompkins Buffalo Soldier
Answer: Buffalo Soldier