Question: Though most famously run by former Vice President Dick Cheney, Halliburton Energy Services was run by Thomas H. Cruikshank during the 80s and early 90s.  What was their primary area of operation?

Context paragraphs:
Larry Klayman: Larry Elliot Klayman (born July 20, 1951) is a politically conservative American lawyer and former U.S. Justice Department prosecutor who has been called a "Clinton nemesis" for his dozens of lawsuits against the Bill Clinton administration in the 1990s.  The founder of Judicial Watch and the government watchdog group Freedom Watch, he has brought legal action against former Vice President Dick Cheney, President Barack Obama, OPEC, Iran, Facebook CEO Mark Zuckerberg, and the National Security Agency (NSA).  In the last case, federal judge Richard J. Leon ruled in December 2013 that the NSA's bulk collection of telephony metadata violated the Fourth Amendment.

Halliburton: The Halliburton Company, an American multinational corporation.  One of the world's largest oil field service companies, it has operations in more than 70 countries.  It owns hundreds of subsidiaries, affiliates, branches, brands, and divisions worldwide and employs approximately 50,000 people.

Philip Perry: Philip J. Perry (born October 16, 1964) is an American attorney and was a political appointee in the administration of George W. Bush.  He was acting associate attorney general at the Department of Justice, general counsel of the Office of Management and Budget, and general counsel of the Department of Homeland Security.  He is a partner at Latham & Watkins in Washington, D.C. He is the son-in-law of former Vice President Dick Cheney.

Thomas H. Cruikshank: Thomas H. Cruikshank was chairman and CEO of Halliburton Energy Services from 1989 to 1995.  He previously served as President and CEO from 1983 to 1989.  During his tenure in the early 1990s, Halliburton provided extensive service to Kuwait in the aftermath of Operation Desert Storm.  He was replaced at Halliburton by Dick Cheney.  Cruikshank served on the Board of Directors of Lehman Brothers from 1996 until it collapsed in 2008.

Energy Task Force: The Energy Task Force, officially the National Energy Policy Development Group (NEPDG), was a task force created by then-U.S. President George W. Bush in 2001 during his second week in office.  Vice President Dick Cheney was named chairman.  This group's stated objective was to “develop a national energy policy designed to help the private sector, and, as necessary and appropriate, State and local governments, promote dependable, affordable, and environmentally sound production and distribution of energy for the future."  The final report was released on May 16, 2001.

Cheney v. United States District Court: Cheney v. United States District Court, 542 U.S. 367 (2004), was a 2004 United States Supreme Court case between Vice President Dick Cheney and the U.S. District Court for the District of Columbia.  The case came as an appeal after the lower District Court for the District of Columbia ordered Cheney to disclose some of his records that would show how his National Energy Policy Development Group developed its recommendations.  Cheney appealed the decision to the Court of Appeals for the DC Circuit, but the Appeals Court rejected the appeal.  In a 7–2 decision, the Court sent the case back to the U.S. Court of Appeals for the D.C. Circuit.

David J. Lesar: David John Lesar is an American businessman who is the Chairman of Halliburton Energy Services.  He was the CEO of Halliburton for 17 years from 2000 to 2017.  Trained as a Certified Public Accountant, Lesar spent 16 years at Arthur Andersen.  He had spent most of his career at Andersen, where he worked on their Halliburton account.  In 1995, Lesar was hired by Halliburton as a new vice president.

The Daily Caller: The Daily Caller is a politically conservative American news and opinion website based in Washington, D.C. It was founded by Tucker Carlson, a conservative political pundit, and Neil Patel, former adviser to former Vice President Dick Cheney.  The site's coverage includes politics, business, world news, entertainment, sports, education, technology, outdoors, and energy.

Angler: The Cheney Vice Presidency: Angler: The Cheney Vice Presidency is a book by "Washington Post" investigative reporter Barton Gellman, published in 2008.  Presenting information in a narrative fashion, Gellman asserts that United States Vice President Dick Cheney misled Republican leaders about the threat of Iraq before the invasion of Iraq by the United States.  The book levels several allegations against Cheney and his administration.  The book is based on hundreds of previously unpublished interviews with high-ranking government officials.

In My Time: A Personal and Political Memoir: In My Time: A Personal and Political Memoir is a memoir written by former Vice President of the United States Dick Cheney with Elizabeth Cheney.  The book was released on August 30, 2011 and outlines Cheney's version of 9/11, the War on Terrorism, the 2001 War in Afghanistan, the run-up to the 2003 Iraq war, enhanced interrogation techniques and other events.  According to Barton Gellman, the author of "", Cheney's book differs from publicly available records on details surrounding the NSA surveillance program.  Cheney discusses his both good and bad interactions with his peers during the Presidency of George W. Bush.

Supporting paragraphs: Thomas H. Cruikshank Halliburton
Answer: oil field service