Question: What section of the military is the Corps area and the National Guard of the United States?

Context paragraphs:
Robert I. Gruber: Major General Robert I. Gruber is a retired United States Air Force officer who served as an assistant to the director, Air National Guard, for special projects, as the Air National Guard assistant to the judge advocate general and as principal advisor on Air National Guard legal services matters to the judge advocate general.  His responsibilities included training oversight and operational readiness of more than 260 Air National Guard attorneys and more than 160 Air National Guard paralegals, and as chair of the judge advocate general's Air National Guard council, coordinating policies and programs for Air National Guard judge advocates and paralegals with the judge advocate general and the director, Air National Guard.

George G. Finch: Maj. Gen. George G. Finch became the Senior Leader of the US Air National Guard; (Chief of the Air Division National Guard Bureau) (1948-1950) In June 1953 it was reported that Gen. Mark W. Clark would retire and be replaced by Maj. Gen George G. Finch on the UN command delegation to the Korean armistice talks George G. Finch, born April 11, 1902 in Dade City, Florida, is considered one of the pioneers in United States aviation history.  He began his military career during World War 1, enlisting in the Aviation Section of the Army's Signal Corps in 1918.  He remained in the Reserve Corps after the war, and in 1926, became Commander, 27th Pursuit Squadron, 1st Pursuit Group.  In 1940, Georgia Governor Ed Rivers commissioned him to form the first flying unit of the Georgia Air National Guard.  The unit was mobilized into the U.S. Army in September, 1941, with Major Finch as commander.  After World War II, he was a leading critic of efforts to eliminate the air arm of the National Guard during peacetime.  General Finch gained the respect and admiration of Air National Guardsmen throughout the nation with his steadfast support and successful efforts to preserve the Air Guard.  He became the first Chief of the Air Force Division of the National Guard Bureau in 1948.  Under his leadership, the Air National Guard built to combat readiness and was among the first components called into service after the outbreak of the Korean War.  As a result of General Finch's vision and perseverance, 45,000 highly trained officers and airmen of 22 wings and 65 squadrons gave the Air Force the strength it needed in the early, critical phases of the Communist drive down the Korean peninsula.General Finch served as the senior Air Force member of the United Nations negotiating team at the peace talks at Panmunjom, Korea, and received the Legion of Merit for outstanding service in 1955; General Finch assumed command of Fourteenth Air Force, Robins AFB, Georgia, becoming the nation's first Air National Guardsman to head a numbered air force.  General Finch had a career of "firsts" including the US Army's first night landing with a single, five-million-candlepower floodlight in 1927.  He also established and endowed the General John P. McConnell Award at the United States Air Force Academy.  Considered by many as the father of the strong, independent Air National Guard existing today, General Finch retired in 1957.  No man has had greater impact on the Air Force Reserve and National Guard than has General George G. Finch.A graduate of the University of Georgia and a member of the Georgia Bar, General Finch was enshrined in the Georgia Aviation Hall of Fame May 18, 1996.

Vice Chief of the National Guard Bureau: The Vice Chief of the National Guard Bureau (VCNGB) is the second highest-ranking officer of the National Guard Bureau, which is a joint activity of the United States Department of Defense.  The Vice Chief of the National Guard Bureau is the second in charge of the National Guard of the United States; which is a joint reserve component of the United States Army and the United States Air Force.  The VCNGB serves as the principal advisor to the Chief of the National Guard Bureau and the Secretary of Defense, through the Chairman of the Joint Chiefs of Staff, on matters involving non-federalized National Guard forces and on other matters as determined by the United States Secretary of Defense.  The VCNGB also serves as the principal adviser to the Secretary of the Army, Secretary of the Air Force, the Chief of Staff of the Army, and the Chief of Staff of the Air Force, on matters relating to federalized forces of the National Guard of the United States and its subcomponents; the Army National Guard of the United States, and the Air National Guard of the United States.

Kansas Army National Guard: The Kansas Army National Guard is a component of the Army National Guard and the Kansas National Guard.  Kansas Army National Guard units are trained and equipped as part of the United States Army.  The same ranks and insignia are used and National Guardsmen are eligible to receive all United States military awards.  The Kansas Guard also bestows a number of state awards for local services rendered in or to the state of Kansas.  It is, along with the Kansas Air National Guard, an element of the Kansas National Guard.

Arkansas National Guard during World War I: The history of the Arkansas National Guard and World War I begins with the reorganization of the Arkansas State Guard following the Spanish–American War.  As a result of difficulties encountered during the mobilization of state militia forces, the United States Congress passed new legislation which resulted in the renaming of the Arkansas State Guard as the Arkansas National Guard.  The new federal legislation resulted in increased funding and training for the guard.  The newly reorganized Arkansas National Guard was call upon by the President to help defend the border with Mexico in 1916 in response to cross border raids during the Mexican Revolution.  The Arkansas National Guard had just returned from the Mexican Expedition in 1917 when it was activated for World War I.  As a part of their incorporation in the United States Army, all National Guard units were renumbered in accordance with a federal system.  The Arkansas National Guard units were incorporated into the 39th Infantry Division and after training at Camp Beauregard, were shipped to France in August and September 1918.  The 39th Division was broken up, with some units being used as replacements for other divisions.  Most former Arkansas National Guardsmen returned to the United States in February through June 1919 and were demobilized.

Oklahoma National Guard: The Oklahoma National Guard, a division of the Oklahoma Military Department, is the component of the United States National Guard in the U.S. state of Oklahoma.  It comprises both Army (OKARNG) and Air (OKANG) National Guard components.  The Governor of Oklahoma is Commander-in-Chief of the Oklahoma National Guard when not on federal active duty.  The state's highest-ranking military commander, the Adjutant General of Oklahoma (TAG), serves as the military head of the Guard and is second only to the Governor.  The TAG is served by three Assistant Adjutants General, all brigadier generals, two from the Army Guard in the state, and the other the Air Guard chief.  These positions are held by Army BG Michael C. Thompson, Army BG Hopper T. Smith, and Air Force BG Gregory L. Ferguson.  The two components each have a senior noncommissioned officer, State Command Sergeant Major for Army, currently CSM Tony Riggs, and State Command Chief Master Sergeant for Air, currently CCMSgt Ronald D. Teague.  The TAG is also served by his Director of the Joint Staff or Chief of Staff, who has direct oversight of the state's full-time National Guard military personnel and civilian employees.  This position is held by COL Jon Harrison.

National Guard of the United States: The National Guard of the United States, part of the reserve components of the United States Armed Forces, is a reserve military force, composed of National Guard military members or units of each state and the territories of Guam, of the Virgin Islands, and of Puerto Rico, as well as of the District of Columbia, for a total of 54 separate organizations.  All members of the National Guard of the United States are also members of the militia of the United States as defined by  /246 § 246  .  National Guard units are under the dual control of the state and the federal government.

Corps area: A Corps area was a geographically-based organizational structure (area command) of the United States Army used to accomplish administrative, training and tactical tasks from 1920 to 1942.  Each corps area included divisions of the Regular Army, Organized Reserve and National Guard of the United States.  Developed as a result of serious mobilization problems during World War I, this organizational scheme provided a framework to rapidly expand the Army in time of war or national emergency such as the Great Depression.

Ohio National Guard: The Ohio National Guard comprises the Ohio Army National Guard and the Ohio Air National Guard.  The commander-in-chief of the Ohio Army National Guard is the governor of the state of Ohio.  If the Ohio Army National Guard is called to federal service, then the commander-in-chief becomes the President of the United States.  The military commander of all forces in the State of Ohio is the Adjutant General, Major General Deborah A. Ashenhurst (the first woman to hold this position) is responsible for the command of 17,000 members, preparedness and readiness, installation management, and budget of the Ohio National Guard.  The current Assistant Adjutant General for Army, with responsibility for overseeing the Ohio Army National Guard training and operations, is Major General John C. Harris Jr. The current Assistant Adjutant General for Air is Brigadier General Stephen E Markovich, with responsibility for overseeing the Ohio Air National Guard.

Illinois National Guard: The Illinois National Guard comprises both Army National Guard and Air National Guard components.  As of 2013, the Illinois National Guard has approximately 13,200 members.  The National Guard is the only United States military force empowered to function in a state status.  The Constitution of the United States specifically charges the National Guard with dual federal and state missions.  Those functions range from limited actions during non-emergency situations to full scale law enforcement of martial law when local law enforcement officials can no longer maintain civil control.  The National Guard may be called into federal service in response to a call by the President or Congress.

Supporting paragraphs: Corps area National Guard of the United States
Answer: reserve