Earlier today, Tripwire Interactive released the Reinforcement Update Pack for all owns of Red Orchestra 2 and Rising Storm. This content is free to everybody that owns those games. To mark the occasion, Red Orchestra 2 is free to play via Steam from now until Monday, October 26 at 1PM (ET) along with being on sale for 75% off.
The Reinforcement Update Pack consists of:

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[ATTACH=CONFIG]1901[/ATTACH][ATTACH=CONFIG]1902[/ATTACH][ATTACH=CONFIG]1903[/ATTACH][ATTACH=CONFIG]1904[/ATTACH][ATTACH=CONFIG]1905[/ATTACH]