Drowning in debt, in 1971 Lockheed (then the largest US defense contractor) asked the US government for a loan guarantee, to avoid insolvency. Lockheed argued that a government bailout was necessary due to the company's value for U.S. national security. The measure was hotly debated in the US Senate. The chief antagonist was Senator William Proxmire (D-Wis), the nemesis of Lockheed and its chairman, Daniel J. Haughton. Following a fierce debate, Vice President Spiro T. Agnew cast a tie-breaking vote in favor of the measure (August 1971). Lockheed finished paying off the $1.4 billion loan in 1977, along with about $112.22 million in loan guarantee fees.