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?
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.
Vinnell The Vinnell Corporation is an international private military company based in Herndon, Virginia, United States, specializing in military training, logistics, and support in the form of weapon systems maintenance and management consultancy. Vinnell Corporation is a subsidiary of Northrop Grumman Corporation. They are also party to other joint-venture companies, e.g. Vinnell-Brown & Root (VBR). The Vinnell Corporation was mentioned in "Fahrenheit 9/11" for its connections to the Carlyle Group, George W. Bush, and the Saudi Royal family.