As previously mentioned, Blackwater, renamed to Xe Services LLC, was contracted by the US government to provide training and diplomatic security, most notably in the Middle East, for much of the last decade. Its presence alongside US diplomatic and military personnel came under scrutiny after several incidents resulting in the deaths either of civilians or Blackwater employees themselves.
From what Kotaku's seen of the game, players won't be asked to kill innocent civilians -- it's the Blackwater world cleaned up and sanitised.
Players will be asked to pretend their finger is a gun, which it is not.
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