Question: What military organization featured the Negro Cavalry?

Context paragraphs:
Anglo-Saxon military organization: Anglo-Saxon military organization is difficult to analyze because there are many conflicting records and opinions as to the precise occurrences and procedures.  Anglo-Saxon England was known for its tumultuous nature and the constant presence of outside threats and dangers made it necessary for a solid military to be constantly in place.  However, in spite of this, by the 10th century, the Saxon kingdom of England was, perhaps, the best ordered state in Europe with a highly efficient administration that had a solid currency and could raise taxes to support a military establishment.  Even though there is some controversy as to the accurate forms of military organization, some aspects can be deduced from the records that have been preserved.

Fortified Region of Metz: The Fortified Region of Metz comprised the central and most heavily fortified portion of the Maginot Line.  The region was established in 1926 as a military organization for the French fortifications along the frontier with Luxembourg and Germany to the east of Longuyon in northeastern France, forming a shield to the north of the industrialized areas of Metz and Thionville.  The region was dissolved as a military organization on 18 March 1940, its command personnel moving to the 42nd Army Corps.

Olha Basarab: Olha Basarab (Ukrainian: Ольга Михайлівна Басараб September 1, 1889 - February 12, 1924) was a Ukrainian political activist and member of the Ukrainian Military Organization who conducted both charitable and humanitarian work that was recognized by the International Red Cross, as well as military or intelligence work on behalf of the Ukrainian underground.  She was an executive of the Ukrainian Women's Union branch in Lviv Ukraine.  She was arrested by the Polish police after being accused of working with the Ukrainian Military Organization and of spying for Germany (with whom the Ukrainian Military Organization had a working relationship).  Materials indicating cooperation with Germany's intelligence were found at her home.  Different accounts of her death in prison exist range from suicide to murder.  Afterwards she was seen as a martyr and source of inspiration within the Ukrainian community.

Athrun Zala: Athrun Zala (アスラン・ザラ , Asuran Zara ) is a fictional character from the Japanese science fiction anime television series "Mobile Suit Gundam SEED" and its sequel "Mobile Suit Gundam SEED Destiny", part of the Gundam franchise.  In the former, Athrun Zala is introduced as a member from the military organization ZAFT, composed of genetically enhanced humans known as Coordinators.  Participating in the war between Coordinators and regular humans, referred to as Naturals, Athrun discovered that his childhood friend Kira Yamato was a member of the Naturals' military organization, the Earth Alliance, despite being a Coordinator.  Across the series, Athrun encounters Kira and, after almost killing him, Athrun starts questioning his own motives to participate in the war.  Athrun returns in "Gundam SEED Destiny" participating in another war and is the protagonist of its compilation films.  He is voiced in Japanese by Akira Ishida and in English by Samuel Vincent in the Ocean dub and by Chris Hackney in the NYAV dub.

Jewish Military Organization: The Jewish Military Organization was an outgrowth of the Betar movement in Nazi-occupied eastern Europe.  After Menahem Begin fled to Soviet Union territory, Jewish veterans of the Polish Army and the National Military Organisation networked with Polish military officers to prepare for the insurgency against the Third German Reich.  The military background of the organization was a useful attribute in an environment of tyranny and genocide.  The Jewish Military Union, a branch of the Jewish Military Organization, was effective at fighting Axis forces in Warsaw, Poland.

National Military Organization: Narodowa Organizacja Wojskowa (National Military Organization, NOW) was one of the Polish resistance movements in World War II.  Created in October 1939, it did not merge with the Service for Poland's Victory (SZP)/Union of Armed Struggle (ZWZ); later Home Army (AK).  Nevertheless, it recognized the Polish government in exile, which was located in London.  The National Military Organization was politically related to the National Party (SN).  In 1942/1943 it split into two parts; one merged with the Home Army, while another formed the National Armed Forces (NSZ).  After the Warsaw Uprising, most of NOW members formed the National Military Union (NZW).

David R. Segal: David R. Segal (born 1941) is a prominent sociologist, who specializes in civil-military relations, military sociology, and military organization, in the tradition of Morris Janowitz.  He is a distinguished scholar-teacher and professor of sociology at the University of Maryland.  He is the founding director of the Center for Research on Military Organization, and is a former president of the Inter-University Seminar on Armed Forces and Society, as well as a former editor of the journal Armed Forces & Society.  He has also served as president of the District of Columbia Sociological Society and of the Section on Armed Forces and Conflict Resol ution of the International Sociological Association, and chair of the Section on Peace, War, and Social Conflict of the American Sociological Association.  He attended public school in Brooklyn, NY and earned his B.A. from Harpur College, State University of New York at Binghamton.  He earned a PhD in sociology at University of Chicago.  He began his academic career in the Sociology Department at the University of Michigan in 1966, and served as Director of Graduate Studies, Associate Chair of the Department, and Director of the Center for Research on Social Organization.  in 1973, he took a leave of absence from Michigan to direct the sociology program at the U.S. Army Research Institute for the Behavioral and Social Sciences.

Polish Military Organization of Upper Silesia: Polish Military Organization of the Upper Silesia (Polish: "Polska Organizacja Wojskowa Górnego Śląska" ) was a secret military organization formed in February 1919 in Upper Silesia.  It was involved in the three Silesian Uprisings, although officially it was disbanded after the Second Uprising.  It had over 20,000 members, including Alfons Zgrzebniok, Jan Wyglenda, Walenty Fojkis, Karol Grzesik, Rudolf Kornke, Wolfgang Kornke, Maksymilian Iksal.

George Jordan: George Jordan (1847 – October 24, 1904) 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 Indian Wars of the western United States.

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:

Supporting paragraphs: George Jordan Buffalo Soldier
Answer: United States Army