Source: GameSpy
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In 2001 a game titled Operation Flashpoint: Cold War Crisis was created by Bohemia Interactive. It was easily the most realistic first-person shooter of its time. In fact, Operation Flashpoint was so realistic that a more advanced version of the game called Virtual Battlespace ("VBS") was adopted for use as a training tool by Australian and New Zealand armed forces as well as the United States Marine Corps. Now, six years later, Bohemia is back with ArmA: Combat Operations, the spiritual successor to OFP.