EA's released the Black Sheep mission for the six-year-old Command & Conquer Generals.
It was initially slated to be the third mission in the Global Liberation Army campaign but was omitted from the game, which released back in 2003.
It sees players "given command of the Toxin Tractor, a slow-going farm vehicle modified to spray a deadly corrosive agent, and ordered to eliminate a town that had been 'corrupted beyond salvation' by the USA's propaganda".
Despite the mission's omission from Generals, the Toxin Tractor was available in other campaign missions, and in the multiplayer and skirmish modes.
You can now download the Black Sheep mission for free here, although you'll need to dig out your copy of Generals in order to be able to play it.