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 "Thomas H. Cruikshank"): Thomas H. Cruikshank was chairman and CEO of Halliburton Energy Services from 1989 to 1995.
Relevant evidence: Yes