Arma 2: Reinforcements brings to the Armaversum two new factions - Her Majesty's Armed Forces and private contractors. Play it separately or combine with original Arma 2: Combined Operations for ultimate military combat experience. Join the massive online multiplayer battles with up to 50 players and hundreds of AI units!

Arma 2: British Armed Forces
Two months after the Allied military victory in Takistan, the new government is restoring the war-torn country. NATO forces assisting in this effort face the threat of insurgency, waged by the remnants of the defeated Takistani army in the mountainous regions of Takistan. A company team of British paratroopers patrolling the treacherous mountains in Zargabad's vicinity is ordered to battle the amassing guerilla warriors.

Arma 2: Private Military Company
One year after British and coalition armed forces successfully quelled the insurgent uprising in Takistan, the NATO Green Sea deployment is in the process of a strategic drawdown of combat troops in the region. Private military contractors shoulder the burden of the increased workload, with competition rising between the multinational organizations for lucrative security contracts. Private Military Company, ION, Inc. (formerly Black Element), successfully bid for a contract - codenamed Black Gauntlet - to provide security for a UN investigation team as they seek to piece together information regarding Takistan's abandoned nuclear weapons program.