Question: The Unknown Known, is a 2013 American documentary film about the political career of former U.S. Secretary of Defense and congressman Donald Rumsfeld, an American retired politician and businessman, heserved as the 13th Secretary of Defense from 1975 to 1977 under which President?  

Context paragraphs:
Leonardo Álvarez Romo: Leonardo Álvarez Romo (born 7 October 1972) is a Mexican politician affiliated with the Ecologist Green Party of Mexico.  Former Mexican congressman in two occasions, he started his political career in 1994 at the campaign of the presidential candidate Luis Donaldo Colosio Murrieta, along with the actual Mexican Senator, Armando Ríos Peter.  After the assassination of Colosio, he worked in the environmental NGO that he founded and called CAMBIOS (Changes) and continued his studies in Political Sciences and Public Administration.  Later on, he was the personal assistance of the famous politician Manuel Camacho Solis, in the Center Democratic Party from 1997 to 2000.  Then in November 2000 he affiliate to the Green Party of Mexico.  From 2000 to 2003 he was the political adviser of the green legislators in the Mexican Senate, and then adviser of the President of the Green party of Mexico.  Later on, he was postulated by his Party as Deputy of the LIX Legislature of the Mexican Congress as a plurinominal representative from 2003 to 2006.  There as a congressman, he was President of the Special Commission for the Reform of the State, member of the Commissions of National Defense, Indigenous Affairs, Environmental Affairs, and Fishing Affairs.  He reformed the Environmental Law to make the Army and the Navy of Mexico participate in the protection of the environment, also he left a profound study of the necessities of a Political Reform for Mexico.  Then, from 2006 to 2009, he was Deputy of the House of Representatives of Mexico City.  There he was Leader of the Greens, President of the Commission of Environmental Affairs, and in several occasions Chairman and Vice-chairman of the House of Representatives of Mexico City.  He reformed the Law to create the Environmental Police, to prohibit the use of plastic bags in supermarkets and stores, and to create the Forest Firefighters.  From 2004 to 2012 he was the Secretary of Foreign Affairs of the Green Party of Mexico.  He was elected in Santiago, Chile, President of the Federation of Green Parties in the Americas for the term 2009-2011.  At the moment he works in the Federal Government, at the Ministry of Environment and Natural Resources, with the position of General Director in matters of Indigenous, Legislative and NGO´s Affairs.

Donald Rumsfeld: Donald Henry "Don" Rumsfeld (born July 9, 1932) is an American retired politician and businessman.  Rumsfeld served as the 13th Secretary of Defense from 1975 to 1977 under President Gerald Ford, and as the 21st Secretary of Defense from 2001 to 2006 under President George W. Bush.  He is both the youngest and the second oldest person to have served as Secretary of Defense.  Additionally, Rumsfeld was a three-term U.S. Congressman from Illinois (1963–1969), Director of the Office of Economic Opportunity (1969–1970), Counsellor to the President (1969–1973), the United States Permanent Representative to NATO (1973–1974), and White House Chief of Staff (1974–1975).

Southern Center for International Studies: The Southern Center for International Studies (SCIS), founded in 1962, is a non-profit, private organization dedicated to international study.  Located in Atlanta, GA, it hosts several annual events, such as the Retired Secretaries of Defense Conference, and regularly hosts events for visiting dignitaries such as Tenzin Gyatso (the current Dalai Lama), Crown Prince Hassan of Jordan, President of Georgia Mikhail Saakashvili, former Secretaries of State Madeleine Albright and Colin Powell, former Secretary of the Treasury Robert Rubin, and former Secretary of Defense Donald Rumsfeld.

M. Staser Holcomb: M. Staser Holcomb (born January 18, 1932) is a retired a vice admiral in the United States Navy.  His hometown is Seattle, Washington, where he attended Roosevelt High School.  He is a graduate of the United States Naval Academy, class of 1953.  During his naval career he served as commander of the USS "Guam" (LPH-9), Carrier Strike Group One, and the United States Seventh Fleet, from September 15, 1981 to May 9, 1983.  He retired in 1985.  During his career he also worked in the offices of the Secretary of Defense (as Senior Military Assistant), Secretary of the Navy, and Chief of Naval Operations.  From 2001 to 2006, he also served as an advisor to Secretary of Defense Donald Rumsfeld and Harold Brown.

Paul McHale: Paul Francis McHale, Jr. (born July 26, 1950) is an American politician.  From 2003 to 2009, he served as the Assistant Secretary of Defense for Homeland Defense.  Additionally, from 1993 to 1999, he represented Pennsylvania's 15th congressional district in the United States House of Representatives.  In 1992, McHale defeated former U.S. Congressman Donald L. Ritter for his seat representing the Lehigh Valley in the U.S. Congress.  Currently, McHale is the President of Civil Support International LLC, which is a consulting firm that advises private contractors and government agencies in matters related to disaster preparedness, crisis response, and homeland defense and security.

The Unknown Known: The Unknown Known (also known as The Unknown Known: The Life and Times of Donald Rumsfeld) is a 2013 American documentary film about the political career of former U.S. Secretary of Defense and congressman Donald Rumsfeld, directed by Academy Award winning documentarian and filmmaker Errol Morris.  The film is a summary of 33 hours of interviews that Morris conducted with Rumsfeld over eleven separate sessions during visits to Newton, Massachusetts.  It is dedicated to the memory of Roger Ebert.  The film was released on April 4, 2014, by Radius-TWC.

Rasul v. Rumsfeld: Shafiq Rasul, Asif Iqbal, Ruhal Ahmed, and Jamal Al-Harith, four former Guantánamo Bay detainees, filed suit in 2004 in the United States District Court in Washington, DC against former Secretary of Defense Donald Rumsfeld.  They charged that illegal interrogation tactics were permitted to be used against them by Secretary Rumsfeld and the military chain of command.  The plaintiffs each sought seek compensatory damages for torture and arbitrary detention while being held at Guantánamo.

Samuel Provance: Samuel Provance is a former U.S. Army military intelligence sergeant, known for disobeying an order from his commanders in the 302nd Military Intelligence Battalion by discussing with the media his experiences at the Abu Ghraib Prison, where he was assigned from September 2003 to February 2004.  After being disciplined for his actions, he eventually brought his case to the United States Government in February 2006, resulting in a Congressional subpoena of the Secretary of Defense Donald Rumsfeld.  The main points of his testimony are that military intelligence soldiers and contracted civilian interrogators had abused detainees, that they directed the military police to abuse detainees, the extent of this knowledge at the prison, and the subsequent cover-up of these practices when investigated.

Office of Force Transformation: The United States Department of Defense Office of Force Transformation (OFT) was established October 29, 2001 in the Office of the Secretary of Defense.  Secretary of Defense Donald Rumsfeld called for the creation of this new office to support his transformation vision along with President George W. Bush’s broad mandate to transform U.S. military capabilities.  The transformation process intends to challenge the status quo with new concepts for American defense to ensure an overwhelming and continuing competitive advantage.  The Director, Force Transformation serves as advocate, focal point, and catalyst for transformation among the Department, reporting directly to the Secretary and Deputy Secretary of Defense.

Rumsfeld Doctrine: The "Rumsfeld Doctrine", named after former United States Secretary of Defense Donald Rumsfeld, is a neologism created by journalists concerned with the perceived transformation of the military of the United States.  It would be considered Rumsfeld's own take on RMA (Revolution in Military Affairs).  It seeks to increase force readiness and decrease the amount of supply required to maintain forces, by reducing the number in a theater.  This is done mainly by using LAVs (Light Armoured Vehicles) to scout for enemies who are then destroyed via airstrikes.  The basic tenets of this military strategy are:

Supporting paragraphs: The Unknown Known Donald Rumsfeld
Answer: Gerald Ford