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?
Sentence (from "Cheney v. United States District Court"): 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.
Relevant evidence: No