mission during Operation Rolling Thunder over Hanoi in October 1967, he was shot down, seriously injured, and captured by the North Vietnamese. He was a prisoner of war until 1973. He experienced episodes of torture and refused an out-of-sequence early release. The wounds that he sustained during the war left him with lifelong physical disabilities. He retired from the Navy as a captain in 1981 and moved to Arizona, where he entered politics. In 1982, he was elected to the United States House of Representatives, where he served two terms. He entered the U.S. Senate in 1987 and easily won reelection five times, the final time in 2016. While generally adhering to conservative principles, McCain also had a media reputation as a "maverick" for his willingness to disagree with his party on certain issues. After being investigated and largely exonerated in a political influence scandal of the 1980s as one of the Keating Five, he made campaign finance reform one of his signature concerns, which eventually resulted in passage of the McCain–Feingold Act in 2002. He was also known for his work in the 1990s to restore diplomatic relations with Vietnam, and for his belief that the Iraq War should have been fought to a successful conclusion. He chaired the Senate Comm