ArmA: Arrowhead or Operation Arrowhead?

[Takko 10]

Is it that the addon includes the name of the main series

(e.g. Operation Flashpoint Resistance) like ArmA: Operation Arrowhead

or is it a completely own name?

[rekrul 7]

It's a standalone game where you don't need arma2, if that's what you're asking about.

[myshaak 0]

Read this.

[W0lle 1052]

You could have checked the FAQ for this title and if there are still open questions asked them in the Operation Arrowhead thread.