In the new downloadable content for Red Faction: Armageddon, "Path to War," you get to take part in the destruction of Mars' Terraformer. Screw you, oxygen! This add-on is available now on Xbox Live (560 Microsoft Points) and PlayStation Network ($6.99).
This release comes at an interesting time, given the still-recent news that THQ will not be continuing the series in any meaningful way. "Path to War" includes four surface missions (with vehicles), the Sharpshooter harpoon gun and Shard Storm projectile cannon, and more Achievements/Trophies.