Question: Jack Brennan served in a military organisation founded by who?

full_context: Document 1: Richard Nixon: Richard Milhous Nixon (January 9, 1913 -- April 22, 1994) was an American politician who served as the 37th President of the United States, serving from 1969 until 1974, when he resigned from office, the only U.S. president to do so. He had previously served as the 36th Vice President of the United States from 1953 to 1961, and prior to that as a U.S. Representative and also Senator from California.
Document 2: Saturday Night Massacre: The Saturday Night Massacre was a series of events which took place in the United States on the evening of Saturday, October 20, 1973, during the Watergate scandal. U.S. President Richard Nixon ordered Attorney General Elliot Richardson to fire independent special prosecutor Archibald Cox; Richardson refused and resigned effective immediately. Nixon then ordered Deputy Attorney General William Ruckelshaus to fire Cox; Ruckelshaus refused, and also resigned. Nixon then ordered the third-most - senior official at the Justice Department, Solicitor General Robert Bork, to fire Cox. Bork considered resigning, but did as Nixon asked. The political and public reaction to Nixon's actions were negative and highly damaging to the president. A new special counsel was appointed eleven days later on November 1, 1973, and on November 14, 1973, a court ruled that the dismissal had been illegal.
Document 3: Continental Army: On June 15, 1775, the Congress elected by unanimous vote George Washington as Commander - in - Chief, who accepted and served throughout the war without any compensation except for reimbursement of expenses.
Document 4: Jack Brennan: John Vincent Brennan (born August 16, 1937) is a retired United States Marine Corps officer and former political aide. He is best known as being U.S. President Richard Nixon's post-resignation chief of staff.
Document 5: United States Marine Corps: The history of the Marine Corps began when two battalions of Continental Marines were formed on 10 November 1775 in Philadelphia as a service branch of infantry troops capable of fighting on both at sea and on shore. By the mid-20th century, the U.S. Marine Corps had become a major theorist of amphibious warfare, which were utilized in the Pacific theater of World War II. As of 2016, the USMC has around 182,000 active duty members and some 38,500 reserve Marines. It is the smallest U.S. military service within the DoD.
Document 6: Gerald Ford: Gerald Rudolph Ford Jr. (born Leslie Lynch King Jr.; July 14, 1913 -- December 26, 2006) was an American politician who served as the 38th President of the United States from August 1974 to January 1977, following the resignation of Richard Nixon. Prior to this he served eight months as the 40th Vice President of the United States, following the resignation of Spiro Agnew. He was the first person appointed to the vice presidency under the terms of the 25th Amendment, and consequently the only person to have served as both Vice President and President of the United States without being elected to executive office. Before his appointment to the vice presidency, Ford served 25 years as U.S. Representative from Michigan's 5th congressional district, the final nine of them as the House Minority Leader.
Document 7: Surgeon General of the United States: In 1798, Congress established the Marine Hospital Fund, a network of hospitals that cared for sick and disabled seamen. The Marine Hospital Fund was reorganized along military lines in 1870 and became the Marine Hospital Service -- predecessor to today's United States Public Health Service. The service became a separate bureau of the Treasury Department with its own staff, administration, headquarters in Washington, D.C, and the position of Supervising Surgeon (later Surgeon General).
Document 8: Lyndon B. Johnson: Lyndon Baines Johnson (/ ˈlɪndən ˈbeɪnz /; August 27, 1908 -- January 22, 1973), often referred to by his initials LBJ, was an American politician who served as the 36th President of the United States from 1963 to 1969, assuming the office after having served as the 37th Vice President of the United States from 1961 to 1963. A Democrat from Texas, he also served as a United States Representative and as the Majority Leader in the United States Senate. Johnson is one of only four people who have served in all four federal elected positions.
Document 9: Samuel Nicholas: Samuel Nicholas (1744 – 27 August 1790) was the first officer commissioned in the United States Continental Marines (predecessor to the United States Marine Corps) and by tradition is considered to be the first Commandant of the Marine Corps.
Document 10: Jethro Sumner: Sumner was named the commanding officer of the 3rd North Carolina Regiment of the North Carolina Line, a formation of the Continental Army, in 1776, and served in both the Southern theater and Philadelphia campaign. He was one of five brigadier generals from North Carolina in the Continental Army, in which capacity he served between 1779 and 1783. He served with distinction in the battles of Stono Ferry and Eutaw Springs, but recurring bouts of poor health often forced him to play an administrative role, or to convalesce in North Carolina. Following a drastic reduction in the number of North Carolinians serving with the Continental Army, Sumner became a general in the state's militia but resigned in protest after the North Carolina Board of War awarded overall command of the militia to William Smallwood, a Continental Army general from Maryland. After the end of the war in 1783, Sumner helped to establish the North Carolina Chapter of the Society of the Cincinnati, and became its first president. He died in 1785 with extensive landholdings and 35 slaves.
Document 11: Richard Nixon: Richard Milhous Nixon (January 9, 1913 -- April 22, 1994) was the 37th President of the United States, serving from 1969 until 1974, when he resigned from office, the only U.S. president to do so. He had previously served as the 36th Vice President of the United States from 1953 to 1961, and prior to that as a U.S. Representative and also Senator from California.
Document 12: United States Armed Forces: The history of the U.S. Armed Forces dates to 14 June 1775, with the creation of the Continental Army, even before the Declaration of Independence marked the establishment of the United States. Continental Navy, established on 13 October 1775, and Continental Marines, established on 10 November 1775, were created in close succession afterwards by the Second Continental Congress in order to defend the new nation against the British Empire in the American Revolutionary War.
Document 13: Jacob Zeilin: Jacob Zeilin (July 16, 1806 – November 18, 1880) was the United States Marine Corps' first non-brevet flag officer. He served as the seventh commandant of the United States Marine Corps, from 1864 to 1876.
Document 14: Dwight D. Eisenhower: Since the 19th century, many if not all presidents were assisted by a central figure or "gatekeeper", sometimes described as the President's Private Secretary, sometimes with no official title at all. Eisenhower formalized this role, introducing the office of White House Chief of Staff – an idea he borrowed from the United States Army. Every president after Lyndon Johnson has also appointed staff to this position. Initially, Gerald Ford and Jimmy Carter tried to operate without a chief of staff, but each eventually appointed one.
Document 15: United States Marine Corps: After the war, the Marine Corps fell into a malaise that ended with the appointment of Archibald Henderson as its fifth Commandant in 1820. Under his tenure, the Corps took on expeditionary duties in the Caribbean, the Gulf of Mexico, Key West, West Africa, the Falkland Islands, and Sumatra. Commandant Henderson is credited with thwarting President Jackson's attempts to combine and integrate the Marine Corps with the Army. Instead, Congress passed the Act for the Better Organization of the Marine Corps in 1834, stipulating that the Corps was part of the Department of the Navy as a sister service to the Navy. This would be the first of many times that the independent existence of the Corps was challenged.
ground_truth: Samuel Nicholas
sub_queries: Jack Brennan >> military branch Answer: United States Marine Corps
United States Marine Corps >> founded by Answer: Samuel Nicholas