Question: What national guard prevented the person Hazel Bryan Massery is famous for shouting at from entering a school?
Context: The Missouri Reserve Force, originally known as the Military Reserve Military Force, is the official state defense force of Missouri.  As a state defense force, the MRF is a reserve military force which serves parallel to the Missouri National Guard.  MRF members serve as reservists and therefore can hold full-time jobs while serving, like their National Guard counterparts.  As the MRF falls solely under the command of the state of Missouri, it cannot be federalized or deployed outside the borders of Missouri, unlike the National Guard.  Although the MRF and the Missouri National Guard are separate organizations, the MRF's primary scope is to work alongside the National Guard during stateside operations, or in lieu of the National Guard when the National Guard is deployed outside of Missouri.  Along with the Missouri Army National Guard, the Missouri Air National Guard, and the Missouri Naval Militia, the Missouri Reserve Force is recognized under Missouri law as part of the organized militia of Missouri. 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. The Illinois Army National Guard is a component of the United States Army and the United States National Guard.  With the Illinois Air National Guard it is part of the Illinois National Guard.  National coordination of various state National Guard units are maintained through the National Guard Bureau.  The Illinois Army National Guard is composed of approximately 10,000 soldiers. 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. 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. 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. 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. Hazel Bryan Massery (born  1942 ) was a student at Little Rock Central High School during the African-American Civil Rights Movement (1954–1968).  She was depicted in an iconic photograph that showed her shouting at Elizabeth Eckford, one of the Little Rock Nine, during the school integration crisis.  In her later life, she sought to make amends for her behaviour, briefly becoming friends with Eckford. Roger E. Combs is a retired Major General in the Air National Guard.  His last assignment was as the Director of Strategic Plans and Policy (J-5) for the National Guard Bureau.  In this position he was responsible to the chief, National Guard Bureau to develop, promulgate and implement policy, plans, concepts and strategy for the nearly half million citizen soldiers and airmen of the Army and Air National Guard.  His duties touched and concerned war-fighting, peacetime international activities and aspects of the federal and state homeland security and civil support missions of both the National Guard Bureau and the corporate National Guard.  The mission scope of the J-5 Directorate also includes representing the chief of the National Guard Bureau in Department of Defense, inter-agency, intergovernmental and non-governmental forums.  Previously, General Combs was assistant Adjutant General for Air and deputy commander of Joint Forces Headquarters, Missouri.  He also served as the Air National Guard assistant to commander, First Air Force, Tyndall Air Force Base, Florida. Elizabeth Eckford (born October 4, 1941) is one of the Little Rock Nine, a group of African-American students who, in 1957, were the first black students ever to attend classes at Little Rock Central High School in Little Rock, Arkansas.  The integration came as a result of "Brown v. Board of Education of Topeka".  Elizabeth's public ordeal was captured by press photographers on the morning of September 4, 1957, after she was prevented from entering the school by the Arkansas National Guard.  A dramatic snapshot by Johnny Jenkins (UPI) showed the young girl being followed and threatened by an angry white mob; this and other photos of the day's startling events were circulated around the US and the world by the print press.
Answer: Arkansas National Guard