Question:  William Oliver "Bill" Studeman is a retired Admiral of the United States Navy and former Deputy Director of the United States' Central Intelligence Agency, serving under R. James Woolsey Jr., who also served as undersecretary of which of the Armed Forces?
Context: Rufus Lackland Taylor (January 6, 1910 – September 14, 1978) was an officer in the United States Navy.  There he became Director of the Office of Naval Intelligence and a Vice Admiral.  In 1966 he was appointed as Deputy Director of the Defense Intelligence Agency (DIA), then shortly thereafter as Deputy Director of the CIA, where he served from 1966 to 1969. Robert James "Jim" Woolsey Jr. (born September 21, 1941) is a national security and energy specialist and former Director of Central Intelligence who headed the Central Intelligence Agency from February 5, 1993, until January 10, 1995.  A lawyer by training and trade, he held a variety of government positions in the 1970s and 1980s, including as Under Secretary of the Navy from 1977 to 1979, and was involved in treaty negotiations with the Soviet Union for five years in the 1980s.  His career also included time as a professional lawyer, venture capitalist and investor in the private sector. John Edward McLaughlin (born June 15, 1942) is the former Deputy Director of Central Intelligence and former Acting Director of Central Intelligence.  His CIA career lasted more than 30 years starting in 1972 with a focus on European, Russian, and Eurasian issues in the Directorate of Intelligence.  From 1984 to 1985, he served a rotational tour at the State Department in the Bureau of European and Canadian Affairs, where he was responsible for following European relations with the Middle East, Central America, and Africa.  He served as Deputy Director and Director of the Office of European Analysis from 1985 to 1989; Director of Slavic and Eurasian Analysis from 1989 to 1995; Deputy Director for Intelligence, Vice Chairman for Estimates of the National Intelligence Council, and Acting Chairman of the National Intelligence Council from 1995 to 1997; and Deputy Director for Intelligence from 1997 to 2000 — heading up the Agency's analytical corps. John Norman McMahon (born July 3, 1929) is a former senior U.S. official of the Central Intelligence Agency.  He joined the CIA in 1951, and served as Deputy Director for Operations from 1978-81 and later as Deputy Director of Central Intelligence from 1982 to 1986. Albert M. Calland III (born 1952) is a former United States Navy admiral who was the Deputy Director for Strategic Operational Planning at the National Counterterrorism Center.  He also previously served as Deputy Director of the Central Intelligence Agency from July 2005 to July 2006. Fran Moore is an American former Central Intelligence Agency executive.  Her positions at the agency included Director for Intelligence 2010 to 2014, Deputy Director for Intelligence, Deputy Director for Analytic Programs, Director and Deputy Director of Terrorism Analysis in the Counterterrorism Center and Chief, Deputy Chief of Counterintelligence Analysis. William Oliver "Bill" Studeman (born January 16, 1940) is a retired Admiral of the United States Navy and former Deputy Director of the United States' Central Intelligence Agency, with two extended periods as Acting Director of Central Intelligence.  As Deputy Director of Central Intelligence, he served in the administrations of George H. W. Bush and Bill Clinton under three Directors of Central Intelligence, Robert Gates, R. James Woolsey Jr., and John M. Deutch.  Admiral Studeman retired from the Navy in 1995 after almost 35 years of service.  Between 1988 and 1992 he was director of the National Security Agency; he was the Director of Naval Intelligence, from September 1985 to July 1988. Susan M. Gordon is an American government official who currently serves as Principal Deputy Director of National Intelligence.  Prior to assuming her current role, she was the Deputy Director of the National Geospatial-Intelligence Agency (NGA), having assumed the position on January 1, 2015.  Before joining the NGA, she served as director of the CIA's Information Operations Center and senior cyber adviser to the Director of the Central Intelligence Agency.  Gordon worked for the Central Intelligence Agency for over 25 years. Robert Cardillo is the sixth Director of the National Geospatial-Intelligence Agency and was sworn in October 3, 2014.  He was previously selected by Director of National Intelligence James Clapper to serve as the first Deputy Director of National Intelligence for Intelligence Integration in September 2010.  Clapper said in a statement that the position would "elevate information sharing and collaboration" between those who collect intelligence and those who analyze it.  Cardillo previously served as Deputy Director of the Defense Intelligence Agency (DIA).  Prior to that, he served as the Deputy Director for Analysis, DIA, and Director, Analysis and Production, National Geospatial-Intelligence Agency (NGA). Stephanie O'Sullivan (born October 3, 1959) is a former Principal Deputy Director of National Intelligence (PDDNI) on February 18, 2011.  She worked to assist the Director of National Intelligence (DNI) in managing the day-to-day operations of the intelligence community.  Prior to serving as PDDNI, she served as a senior leader at the Central Intelligence Agency (CIA), rising to the Associate Deputy Director of the CIA before being confirmed as the PDDNI.
Answer: Navy