Question: Which American multinational oil field service company has been testified against in Congress by Bunny Greenhouse in 2005?

full_context: Document 1: Bunny Greenhouse: Bunnatine (Bunny) H. Greenhouse is a former chief contracting officer Senior Executive Service (Principal Assistant Responsible for Contracting (PARC)) of the United States Army Corps of Engineers. On June 27, 2005, she testified to a Congressional panel, alleging specific instances of waste, fraud, and other abuses and irregularities by Halliburton with regard to its operations in Iraq since the 2003 invasion. She described one of the Halliburton contracts (secret, no-bid contracts awarded to Kellogg, Brown and Root (KBR)—a subsidiary of Halliburton) as "the most blatant and improper contract abuse I have witnessed during the course of my professional career".
Document 2: Royal Dutch Shell: Royal Dutch Shell plc (, ), commonly known as Shell, is a British–Dutch multinational oil and gas company headquartered in the Netherlands and incorporated in the United Kingdom. It is one of the six oil and gas "supermajors" and the sixth-largest company in the world measured by 2016 revenues (and the largest based in Europe). Shell was first in the 2013 Fortune Global 500 list of the world's largest companies; in that year its revenues were equivalent to 84% of the Netherlands' $556 billion GDP.
Document 3: Carolyn Wood: Carolyn Wood, United States Army captain, is a military intelligence officer who served in both Afghanistan and Iraq. She was implicated by the Fay Report to have "failed" in several aspects of her command regarding her oversight of interrogators at Abu Ghraib. She was alleged by Amnesty International to be centrally involved in the 2003 Abu Ghraib and 2002 Bagram prisoner abuse cases.
Document 4: United States House Select Committee on Government Contracts: United States House Select Committee on Government Contracts
Document 5: Human rights in post-invasion Iraq: Human rights in post-invasion Iraq have been the subject of concerns and controversies since the 2003 invasion. Concerns have been expressed about conduct by insurgents, the U.S.-led coalition forces and the Iraqi government. The U.S. is investigating several allegations of violations of international and internal standards of conduct in isolated incidents by its own forces and contractors. The UK is also conducting investigations of alleged human rights abuses by its forces. War crime tribunals and criminal prosecution of the numerous crimes by insurgents are likely years away. In late February 2009, the U.S. state department released a report on the human rights situation in Iraq, looking back on the past year (2008).
Document 6: BP: BP P.L.C., formerly British Petroleum, is a British multinational oil and gas company headquartered in London. It is one of the world's seven oil and gas "supermajors", whose performance in 2012 made it the world's sixth-largest oil and gas company, the sixth-largest energy company by market capitalization and the company with the world's twelfth-largest revenue (turnover). It is a vertically integrated company operating in all areas of the oil and gas industry, including exploration and production, refining, distribution and marketing, petrochemicals, power generation and trading. It also has renewable energy interests in biofuels and wind power.
Document 7: B.L. Harbert International: B.L. Harbert International, LLC, based in Birmingham, Alabama, is a construction company that began operations in 2000 under the leadership of Billy L. Harbert. The company was founded as the Harbert International division of Harbert Corporation. B.L. Harbert has two main operating divisions, the U.S. Division and the International Division. The U.S. Division is further divided into the following divisions: commercial, healthcare, federal, and civil/industrial. The U.S. and International divisions undertake the preconstruction, general construction, construction management, and design-build services of office buildings, condominiums, institutional buildings, healthcare facilities, churches, industrial facilities, water and wastewater treatment plants. Much of the company's work is for repeat clients. Throughout the world, BL Harbert employs over 7,000 people and typically has over 40 projects underway at all times.
Document 8: Enron: Enron Corporation was an American energy, commodities, and services company based in Houston, Texas. It was founded in 1985 as the result of a merger between Houston Natural Gas and InterNorth, both relatively small regional companies. Before its bankruptcy on December 2, 2001, Enron employed approximately 20,000 staff and was one of the world's major electricity, natural gas, communications and pulp and paper companies, with claimed revenues of nearly $101 billion during 2000. "Fortune" named Enron "America's Most Innovative Company" for six consecutive years.
Document 9: 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.
Document 10: Chevron Corporation: Chevron Corporation () is an American multinational energy corporation. One of the successor companies of Standard Oil, it is headquartered in San Ramon, California, and active in more than 180 countries. Chevron is engaged in every aspect of the oil, natural gas, and geothermal energy industries, including hydrocarbon exploration and production; refining, marketing and transport; chemicals manufacturing and sales; and power generation. Chevron is one of the world's largest oil companies; as of 2014 , it ranked third in the Fortune 500 list of the top US closely held and public corporations and sixteenth on the Fortune Global 500 list of the top 500 corporations worldwide. It was also one of the Seven Sisters that dominated the global petroleum industry from the mid-1940s to the 1970s.
Document 11: Dresser Industries: Dresser Industries was a multinational corporation headquartered in Dallas, Texas, United States, which provided a wide range of technology, products, and services used for developing energy and natural resources. In 1998, Dresser merged with its main rival Halliburton, Halliburton sold many of former Dresser non "oil patch" divisions, retaining the M W Kellogg Engineering and Construction Company and the Dresser oil-patch products and services that complemented Halliburton's energy and natural resource businesses. In 2001 Halliburton sold five separate, but somewhat related former Dresser non "oil patch" divisions, to an investment banking firm. Those five operations later took the name "Dresser Inc." In October 2010, Dresser Inc., was acquired by General Electric. It is headquartered in Addison, Texas.
Document 12: United States House Select Committee to Investigate Alleged Corruptions in Government: United States House Select Committee to Investigate Alleged Corruptions in Government
Document 13: Cockerham bribery case: The Cockerham bribery case involved the investigation and subsequent trials of United States Army contracting officers and their family members who were accused of accepting bribes in return for steering multimillion-dollar contracts to companies providing services for the US Army in Iraq and Kuwait between 2004 and 2007. The alleged ringleader of the accused officers was US Army Major John L. Cockerham, who was sentenced to 17 and 1/2 years in prison for accepting bribes from Army contractors. The contracts, mainly for bottled water, involved at least three US Army contracting officers, two of their family members, six companies from India, Saudi Arabia, Kuwait, and the United States, and up to $15 million in bribe money.
Document 14: The Hertz Corporation: The Hertz Corporation, a subsidiary of Hertz Global Holdings Inc., is an American car rental company based in Estero, Florida that operates 9,700 international corporate and franchisee locations. As the second-largest US car rental company by sales, locations, and fleet size, Hertz operates in 150 countries, including North America, Europe, Latin America, Africa, Asia, Australia, The Caribbean, the Middle East, and New Zealand. The Hertz Corporation owns Dollar and Thrifty Automotive Group - which separates into Thrifty Car Rental and Dollar Rent A Car.
Document 15: Task Force Shield: Task Force Shield was set up by the Coalition Provisional Authority in 2003 to provide security for Iraq's critical oil infrastructure. The task force was originally composed of a small team of American military personnel, contractors from the UK-based firm Erinys International, and Iraqis hired, trained and supervised by Erinys. The Iraqi force trained by Erinys was called the Oil Protection Force (OPF). After the Coalition Provisional Authority transferred control of Iraq to the Interim Government, the OPF became a subordinate element of Iraq's Ministry of Oil. The Ministry of Oil did not renew the Erinys contract. Task Force Shield was disbanded in 2005. In April 2006, the Office of the Special Inspector General for Iraq Reconstruction published a report on the activities of Task Force Shield. The report determined that Task Force Shield was ultimately unsuccessful and found that there were indications of potential fraud.
ground_truth: Halliburton