Question: What branch of the military did the author of Unlikely Brothers serve in?

full_context: Document 1: Fist, Stick, Knife, Gun: Fist Stick Knife Gun: A Personal History of Violence is a memoir by Geoffrey Canada, an American social activist who is the current president and chief executive officer of Harlem Children's Zone. Beacon Press published the book on January 31, 1995.
Document 2: Charles Preston: Sir Charles Preston, 5th Baronet ("c." 1735 - 23 March 1800) was a British Major who was stationed in Canada during the American Revolutionary War.
Document 3: A Long Way Gone: A Long Way Gone: Memoirs of a Boy Soldier (2007) is a memoir written by Ishmael Beah, an author from Sierra Leone. The book is a firsthand account of Beah's time as a child soldier during the civil war in Sierra Leone (1990s). Beah ran away from his village at the age of 12 after it was attacked by rebels, and he became forever separated from his immediate family. He wandered the war - filled country and was forced to join an army unit who brainwashed him into using guns and drugs. By 13, he had perpetuated and witnessed a great deal of violence. At the age of 16, however, UNICEF removed him from the unit and put him into a rehabilitation program. There he was able to find his uncle that would adopt him. With the help of some of the staff he was able to return to a civilian life and get off drugs. He was then given an opportunity to teach others about child soldiers. He traveled the United States recounting his story.
Document 4: Brodie Haig: General Sir Arthur Brodie Haig, KCB, MC and bar (31 January 1886 – 9 February 1957) was a British officer in the Indian Army. A pre-war regular officer he served in India prior to the outbreak of the First World War when he was posted to the Middle East. He was wounded at the Battle of Shaiba, twice mentioned in dispatches and awarded the Military Cross (MC) before he was taken prisoner by the Ottoman Empire at the Siege of Kut. Escaping captivity in August 1918 he received a bar to his MC.
Document 5: John Prendergast (British Army officer): Brigadier John Hume Prendergast DSO MC & Bar was a British Indian Army, and later British Army, officer and travel writer.
Document 6: Francis Fane (soldier): Colonel Francis Augustus Fane (1824–1893,) was an English officer in the British Army who raised the Peshawar Light Horse during the Indian Mutiny. Fane was also a noted traveller, diarist, artist as well as in later years a successful banker.
Document 7: Philip Miles (Indian Army officer): Brigadier-General Philip John Miles, CB, CMG, FRGS, (23 December 1864 – 26 December 1948) was a British officer of the Indian Army during the late nineteenth and early twentieth century. After an early career serving on the North-West Frontier and in Central Asia, he rose to command brigades during the First World War and the Third Anglo-Afghan War.
Document 8: John Staples Harriott: John Staples Harriott (1780–1839) was a British army officer stationed in India, in the service of the East India Company. He came to acquire the "Jami' al-tawarikh" in its original manuscript. In his studies of the Roma people, he made an identification with a legend of Bahram Gur and the Luri to support a Romani presence in Sasanid Persia, now considered to be an unjustified and uncritical deduction that has persisted.
Document 9: Frank Blaker: Born in Kasauli, Punjab, India, Frank Blaker was 24 years old, and a Temporary Major in the Highland Light Infantry, British Army, attached to 3rd Battalion, 9th Gurkha Rifles, in the Indian Army during World War II when the following deed took place for which he was awarded the VC.
Document 10: David Mostyn: Educated at Downside School and at the Royal Military Academy, Sandhurst, David Mostyn was commissioned into the Oxfordshire and Buckinghamshire Light Infantry in 1949. He was mentioned in despatches for helping to suppress the Brunei Revolt in 1962 whilst serving with the 1st Green Jackets (43rd and 52nd). In 1969 he was appointed Commanding Officer of the 2nd Battalion The Royal Green Jackets and was deployed to BAOR and Northern Ireland. In 1972 he went on to command the 8th Infantry Brigade. In 1980 he became Commandant of the British Sector in Berlin and in 1983 he was appointed Military Secretary. He went on to be Adjutant General in 1986 retiring from the British Army in 1989.
Document 11: Protestantism: Also, other human rights were advocated for by some Protestants. For example, torture was abolished in Prussia in 1740, slavery in Britain in 1834 and in the United States in 1865 (William Wilberforce, Harriet Beecher Stowe, Abraham Lincoln - against Southern Protestants). Hugo Grotius and Samuel Pufendorf were among the first thinkers who made significant contributions to international law. The Geneva Convention, an important part of humanitarian international law, was largely the work of Henry Dunant, a reformed pietist. He also founded the Red Cross.
Document 12: Multiracial Americans: Some biographical accounts include the autobiography Life on the Color Line: The True Story of a White Boy Who Discovered He Was Black by Gregory Howard Williams; One Drop: My Father's Hidden Life—A Story of Race and Family Secrets written by Bliss Broyard about her father Anatole Broyard; the documentary Colored White Boy about a white man in North Carolina who discovers that he is the descendant of a white plantation owner and a raped African slave; and the documentary on The Sanders Women of Shreveport, Louisiana.
Document 13: Between the World and Me: Between the World and Me takes the form of a book - length letter from the author to his son, adopting the structure of Baldwin's The Fire Next Time; the latter is directed, in part, towards Baldwin's nephew, while the former addresses Coates's 15 - year - old son. Coates's letter is divided into three parts, recounting Coates's experiences as a young man, after the birth of his son, and during a visit with Mable Jones. Coates contemplates the feelings, symbolism, and realities associated with being black in the United States. He recapitulates the American history of violence against black people and the incommensurate policing of black youth. The book's tone is poetic and bleak, guided by his experiences growing up poor and always at risk of bodily harm. He prioritizes the physical security of African - American bodies over the tradition in black Christianity of optimism, ``uplift, ''and faith in eventual justice (i.e., being on God's side). His background, which he describes as`` physicality and chaos,'' leads him to emphasize the daily corporeal concerns he experiences as an African - American in U.S. culture. Coates's position is that absent the religious rhetoric of ``hope and dreams and faith and progress, ''only systems of white supremacy remain along with no real evidence that those systems are bound to change. In this way, he disagrees with Martin Luther King, Jr.'s optimism about integration and Malcolm X's optimism about nationalism.
Document 14: GraceLand: GraceLand is a 2004 novel by Chris Abani, which tells the story of a teenager named Elvis, who is trying to get out of the ghettos of Lagos, Nigeria. Chris Abani depicts the poverty and violence in Lagos and how it affects the everyday lives of Elvis and his family. Having emigrated from Nigeria himself as a result of the Biafran War, Abani’s novel touches on many issues relevant to corruption, poverty, and violence within the country. Elvis's story also touches on issues related to globalization, and how Nigeria's impoverished communities are affected by this phenomenon. The main focus of this story is on Elvis and how he survives in the often harsh environment that is Nigeria’s largest city; Elvis himself is a complex and sympathetic character who clearly cares for his family despite a turbulent upbringing. However, this is complicated by the numerous illegal and morally questionable jobs he takes part in with his friend Redemption.
Document 15: Unlikely Brothers: Unlikely Brothers: Our Story of Adventure, Loss and Redemption is co-authored by human rights activist and Co-Founder of the Enough Project, John Prendergast and his "Little Brother", Michael Mattocks.
ground_truth: British Army
sub_queries: Unlikely Brothers >> author Answer: John Prendergast
John Prendergast >> military branch Answer: British Army