There is more to fps than CoD, MoH or Battlefield. Bohemian Interactive FPS war simulators are a very different way of playing an fps shooter. Operation Arrowhead if BI's 5th title in the series, that started in 2001 with Operation Flashpoint. BI release each instalment as a stand alone game. So although it looks like an expansion you don't need the other games to play. BI has a very small team and most of the long term players are happy to give BI money for a new game every few years. BI have gained a reputation for supporting the community, giving out awards to moders and community members.
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Three years after the conflict in Chernarus, portrayed in the original ARMA 2, a new flashpoint in the Green Sea region heats up and coalition forces led by the US Army are sent to Takistan to quickly restore peace and prevent further civilian casualties in the unstable region.
The first instalment in the series of ingame videos, introduces the factions in ARMA 2 Operation Arrowhead, forthcoming standalone expansion pack to ARMA 2. This video introduces Alliance forces lead by the US Army which is sent to Takistan to quickly restore peace and prevent further civilian casualties in this unstable region.
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To avoid any misunderstanding - the helicopter without pilot really exists

it's not a bug - it's one of the UAVs and player will have the possibility to use them in game.
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