The Ultimate Fighter Season Six Koppenhaver was a fighter on
The Ultimate Fighter: Team Hughes vs. Team Serra, fighting on
Team Serra. He was not part of the original 16 fighters. Instead, Koppenhaver was brought in as a replacement when
Roman Mitichyan broke his elbow during evaluations and was sent home. Koppenhaver lost by unanimous decision to
Tom Speer. After a dispute with
TNA Wrestling over the use of his nickname, he legally changed his name from "Jon Koppenhaver" to "War Machine" in 2008.
Ultimate Fighting Championship In War Machine's official UFC debut, he defeated
Jared Rollins in
The Ultimate Fighter: Team Hughes vs Team Serra Finale via KO at 2:01 of the third round. War Machine and Rollins both received $25,000 due to winning fight of the night honors and War Machine winning knockout of the night. His last UFC fight was at
UFC 84 against
Yoshiyuki Yoshida which he lost via submission in the first round. He was released from the UFC after rejecting a fight offered by UFC matchmaker Joe Silva, and after comments made about the death of fellow UFC fighter
Evan Tanner. War Machine posted on his Myspace that he believed that Tanner had gone to the isolated southern California desert to kill himself after he realized his career might have been over and basically had made no money during it. Medical examiners eventually ruled that Tanner's death was not a suicide, but War Machine stood by his statements.
Bellator Fighting Championships War Machine was signed and then released by
Bellator Fighting Championships. His
MySpace blog cited disparaging comments about
Barack Obama as the cause for his non-participation in their upcoming tournament.
Independent promotions (2009–2011) On June 20, 2009, War Machine was set to fight
Roger Bowling. They were then set to fight at XFC 9 in Tampa, Florida on September 5, where it was to be the main event and would broadcast live over
HDNet's website. On September 5, 2009, War Machine stepped into the cage and faced off against
Mikey Gomez. The ref stopped the fight, giving a somewhat controversial win to War Machine by TKO (punches), at 13 seconds in the third round. War Machine was scheduled to fight October 3, 2009 against Jacob McClintock, but cancelled the fight so he could fight on October 8, 2009, against
David Mitchell. On April 17, 2010, he was set to face Tex Johnson in the main event of Wild Bill's Fight Night. On April 16,
TMZ.com reported that War Machine left a comment on his Twitter, stating he would not be turning up to the event for the fight.
Return to Bellator Fighting Championships On December 7, 2011, it was announced that War Machine was re-signed to an exclusive deal with
Bellator Fighting Championships and would be competing in its sixth-season Welterweight Tournament. War Machine was expected to fight
Karl Amoussou in the opening round of the welterweight tournament at
Bellator 63. War Machine was sentenced to a year in prison for the prior assault in Las Vegas, Nevada from December 2009 and was forced out of the bout and the tournament. War Machine was set to make his Bellator debut on January 17, 2013, against
Paul Daley when he
tore his ACL and broke his
fibula which forced him out of the fight. War Machine faced
Blas Avena at
Bellator 96 on June 19, 2013. He won via TKO due to punches in round one. War Machine then took part in
Bellator MMA's Season Nine Welterweight Tournament at
Bellator 100 against Vaughn Anderson in the Quarterfinals. He won via technical submission due to a rear naked choke in the second round. War Machine then faced
Ron Keslar on October 18, 2013, at
Bellator 104 in the semifinals of the Season Nine Welterweight Tournament. He lost via technical submission due to a rear naked choke in the first round. On August 8, 2014, Bellator MMA announced the release of War Machine after he assaulted and raped his former girlfriend, pornographic film actress
Christy Mack. ==Adult film career==