Question: Who commands the mounted force of the United States today?

<P0-S0> The United States Cavalry, or U.S. Cavalry, was the designation of the mounted force of the United States Army from the late 18th to the early 20th century. <P0-S1>  The Cavalry branch became the Armor branch with tanks in 1950, but the term "Cavalry" such as "armored cavalry" remains in use in the U.S. Army for mounted (ground and aviation) reconnaissance, surveillance, and target acquisition (RSTA) units based on their parent Combat Arms Regimental System (CARS) regiment. <P0-S2>  "Cavalry" is also used in the name of the 1st Cavalry Division for heraldic/lineage/historical purposes. <P0-S3>  Some combined arms battalions (i.e., consisting of a combination of tank and mechanized infantry companies) are designated as "armor" formations, while others are designated as "infantry" organizations. <P0-S4>  These "branch" designations are again, heraldic/lineage/historical titles derived from the CARS regiments to which the battalions are assigned. <SEP> <P1-S0> The Noble Patron of Armor award is the top award given to supporters of the Army's mounted force by the United States Armor Association of the United States Army. <SEP> <P2-S0> The 1st Cavalry Division ("First Team") is a combined arms division and is one of the most decorated combat divisions of the United States Army, as well as the other four branches of the U.S. military. <P2-S1>  It is based at Fort Hood, Texas. <P2-S2>  As of 2017, the 1st Cavalry Division is subordinate to III Corps and is commanded by Major General John C. Thomson III. <P2-S3>  It was formed in 1921 and served during World War II, the Korean War, the Vietnam War, the Persian Gulf War, with the Stabilization Force in Bosnia-Herzegovina, in the Iraq War, in the War in Afghanistan and in Operation Freedom’s Sentinel. <SEP> <P3-S0> United States Pacific Command (USPACOM) is a unified combatant command of the United States Armed Forces responsible for the Indo-Asia-Pacific region. <P3-S1>  It is the oldest and largest of the unified combatant commands. <P3-S2>  Its commander, the senior U.S. military officer in the Pacific, is responsible for military operations in an area which encompasses more than 100 e6sqmi , or roughly 52 percent of the Earth’s surface, stretching from the waters off the west coast of the United States to the west coast of India, and from the Arctic to the Antarctic. <P3-S3>  The Commander reports to the President of the United States through the Secretary of Defense and is supported by Service component and subordinate unified commands, including U.S. Army Pacific, U.S. Pacific Fleet, U.S. Pacific Air Forces, U.S. Marine Forces Pacific, U.S. Forces Japan, U.S. Forces Korea, Special Operations Command Korea, and Special Operations Command Pacific. <P3-S4>  USPACOM also has three direct reporting units (DRUs), including Daniel K. Inouye Asia-Pacific Center for Security Studies, U.S. Pacific Command Joint Intelligence Operations Center, Center for Excellence in Disaster Management and Humanitarian Assistance; and a Standing Joint Task Force, Joint Interagency Task Force West. <P3-S5>  The USPACOM headquarters building, the Nimitz-MacArthur Pacific Command Center, is located on Camp H.M. Smith, Hawaii.