Patch 1.05 adds a mini-campaign 'Eagle Wing,' set several years after the original ending and casting players as the pilot of an AH-64 Apache helicopter--also new in this patch.

Unlike previous patches--or any patch for almost any game, for that matter--the Patch 1.05 download can be used to update Steam installations of ARMA 2 too.

Other highlights of the patch include performance improvements, AI tweaks, bug fixes, Linux dedicated server support, a new multiplayer mode and the removal of DRM.

• Free bonus campaign Eagle Wing
• Free bonus helicopter addon AH-64D
• New Warfare multiplayer mode When Diplomacy Fails, including 3-sides and support for diplomacy between factions
• Major AI tweaking and balancing (better combat cooperation, better situational awareness, new Suppressive fire command)
• Significant performance improvements, especially in large cities
• Fixed compatibility problems under Windows Vista and Windows 7 x64 with 8 GB and more RAM
• Grass now provides concealment also in distance
• Improved hit detection and damage system
• Improved object visibility and less significant objects popping in distance
• Improved mouse input handling
• Spatial sound improvements
• Automatic launching of user made addons (units, missions etc.) via "pbo" file association with the game
• Possibility to switch between windowed and fullscreen mode at any time in game menus using Alt + Enter or through video options
• Various crash opportunities fixed
• Linux server support added
• New GUI to various dedicated server settings
• New GUI for multiplayer commands
• Enabled commanding during story conversations
• FreeTrack support using FreeTrackClient.dll
• DRM free
• Optional anti-cheat protection