Question: what is arma 2 oa?
Answer: ARMA 2: Operation Arrowhead (ARMA 2: OA; stylized as ARMA II: Operation Arrowhead) is a standalone expansion pack to Bohemia Interactive's tactical shooter ARMA 2. ARMA 2: Operation Arrowhead includes three new multiplayer maps, new vehicles and equipment, new factions, along with a new campaign.