James Rupert Rhodes AKA Rhodey is the character most associated with the War Machine armor. Rhodey filled in for Iron Man when Tony Stark was off drinking, but when Tony returned, Rhodey assumed the War Machine identity.
Rhodey and the War Machine armor first appeared on screen in the 1994 animated Iron Man series.
During the '90's War Machine made the rounds on the animated circuit also appearing in a cameo as a member of SHIELD in an episode of the X-Men animated series.
Next up, War Machine and Spidey teamed up against Venom and Carnage on the Spider-Man animated series.
Then of course, Iron Man and War Machine made a stop on the Incredible Hulk animated series.
After his 90's whistle stop tour, War Machine took a hiatus, with the armor making a quick appearance in 2006 on the Fantastic Four: World's Greatest Superheroes series.
Also in 2006, Tony Stark would don the War Machine armor when his traditional suit got busted up in the Ultimate Avengers 2: Rise of the Panther direct to video movie.
The 2009 Iron Man Armored Adventures featured a young take on Iron Man and his friend Rhodey, and as you could expect, the story eventually led Rhodey back into the War Machine suit.
War Machine is slated to appear sometime in 2010 on the animated Super Hero Squad series.
Though War Machine did not appear in 2007's Iron Man movie, Rhodey sure did, even going as far as to say that some time he would like to try on the Iron Man suit.
Though, Rhodey was recast for 2010's Iron Man 2, it is now confirmed that he will be getting his wish.