Question: Who was the director of a film which the 21st Secretary of Defense appeared in?

Context paragraphs:
Carlos Dominguez III: Carlos "Sonny" Garcia Dominguez III (born September 16, 1945) is a Filipino businessman and former chief executive of Philippine Airlines who is the 31st Secretary of Finance under President Rodrigo Duterte.  He had previously held the position of Secretary of Agriculture and Minister of Natural Resources under the Corazon Aquino presidential administration.  Prior to his appointment to President Duterte's Cabinet, he had served as executive director of PTFC Redevelopment Corp., as independent director of Alsons Consolidated Resources, and as director of United Paragon Mining Corp.  His family owns Marco Polo Hotel in Davao City, one of the top hotels in southern Mindanao.

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).

Daniel Defense: Daniel Defense is an arms manufacturer, founded at the turn of the 21st century by Marty Daniel in Savannah, Georgia.  Following substantial growth, in 2009 Daniel Defense expanded and moved into a new manufacturing facility in Black Creek, Georgia where it is now based.  It has also expanded to a second facility in Ridgeland, South Carolina with 90,000 square feet for production.  Daniel Defense has managed to increase its revenue by more than 100% three years in a row and has been featured in Inc Magazine's Top 5000 list in 2012 and 2013 which shows the fastest growing private companies in the United States.  Over several years of production, Daniel Defense has managed to acquire high-profile customers for its rail systems, such as the US Special Operations Command, and the UK's Ministry of Defence.

Dark Side of the Moon (film): Dark Side of the Moon is a French mockumentary by director William Karel which originally aired on Arte in 2002 with the title Opération Lune.  The basic premise for the film is the theory that the television footage from the Apollo 11 Moon landing was faked and recorded in a studio by the CIA with help from director Stanley Kubrick.  It features some surprising guest appearances, most notably by Donald Rumsfeld, Dr. Henry Kissinger, Alexander Haig, Vernon Walters, Buzz Aldrin and Stanley Kubrick's widow, Christiane Kubrick.

U.S. Commission on National Security/21st Century: The U.S. Commission on National Security/21st Century (USCNS/21), also known as the Hart-Rudman Commission or Hart-Rudman Task Force on Homeland Security, was chartered by Secretary of Defense William Cohen in 1998 to provide a comprehensive review of US national security requirements in the 21st century.  USCNS/21 was tasked "to analyze the emerging international security environment; to develop a US national security strategy appropriate to that environment; and to assess the various security institutions for their current relevance to the effective and efficient implementation of that strategy, and to recommend adjustments as necessary".

Michael Wynne: Michael Walter Wynne (born September 4, 1944) is an American business executive and was the 21st United States Secretary of the Air Force.  Secretary of Defense Robert Gates asked for and received his resignation (and that of Chief of Staff T. Michael Moseley) on June 5, 2008, in the wake of the 2007 United States Air Force nuclear weapons incident and the mistaken shipment of Minuteman III parts to Taiwan in 2006, followed by an investigation by and a critical report from Admiral Kirkland H. Donald regarding the Minuteman incident.

Fernando Bonilla: Fernando J. Bonilla Ortiz (born 1962) is a Puerto Rican political figure and served as the 21st Secretary of State of the Commonwealth of Puerto Rico.  Bonilla also served as the Executive Director of the Puerto Rico Ports Authority.

SC-21 (United States): SC-21 (Surface Combatant for the 21st century) was a research and development program started in 1994 intended to design land attack ships for the United States Navy.  A wide variety of designs were created and extensively examined, including an arsenal ship with 500 cruise missiles.  Eventually a "tumblehome" design of around 16,000 tons with two long-range guns and 128 missile tubes was selected as the DD-21, the Destroyer for the 21st century.  The program ended in November 2001, with a version of the DD-21 emerging as the DD(X) or "Zumwalt" class destroyer.  It was envisaged that the DD-21 hull would be used for a future air defense cruiser (CG-21), which then eventually evolved into the CG(X) program.

Fred Iklé: Fred Charles Iklé (August 21, 1924 – November 10, 2011) was a Swiss-born sociologist and defense expert who became a significant part of the US defense policy establishment.  Iklé's expertise was in defense and foreign policy, nuclear strategy, and the role of technology in the emerging international order.  After a career in academia (including a professorship at MIT) he was appointed director of the U.S. Arms Control and Disarmament Agency in 1973-1977, before becoming Under Secretary of Defense for Policy (1981 to 1988).  He was later a member of the Council on Foreign Relations and the Department of Defense's Defense Policy Board Advisory Committee, a Distinguished Scholar with the Center for Strategic and International Studies (CSIS) and a Director of the National Endowment for Democracy.

John C. Wobensmith: John C. Wobensmith is an American politician from Maryland.  He has served as the 71st Secretary of State of Maryland – a position appointed by the governor and confirmed by the state senate – since January 21, 2015.  The Secretary of State is one of the state's six constitutional officers, along with the Governor, Lt. Governor, Comptroller, Attorney General and Treasurer.  He graduated in English from the University of Pennsylvania and from the National War College of the National Defense University.

Supporting paragraphs: Dark Side of the Moon (film) Donald Rumsfeld
Answer: William Karel